Reapply Support layering fixes.

Compiler.h is used by Demangle (which Support depends on) - so sink it
into Demangle to avoid a circular dependency

DataTypes.h is used by llvm-c (which Support depends on) - so sink it
into llvm-c.

DataTypes.h could probably be fixed the other way - making llvm-c depend
on Support instead of Support depending on llvm-c - if anyone feels
that's the better option, happy to work with them on that.

I /think/ this'll address the layering issues that previous attempts to
commit this have triggered in the Modules buildbot, but I haven't been
able to reproduce that build so can't say for sure. If anyone's having
trouble with this - it might be worth taking a look to see if there's a
quick fix/something small I missed rather than revert, but no worries.

llvm-svn: 328123
diff --git a/llvm/include/llvm-c/DataTypes.h.cmake b/llvm/include/llvm-c/DataTypes.h.cmake
new file mode 100644
index 0000000..19799ef
--- /dev/null
+++ b/llvm/include/llvm-c/DataTypes.h.cmake
@@ -0,0 +1,135 @@
+/*===-- include/llvm-c/DataTypes.h - Define fixed size types ------*- C -*-===*\
+|*                                                                            *|
+|*                     The LLVM Compiler Infrastructure                       *|
+|*                                                                            *|
+|* This file is distributed under the University of Illinois Open Source      *|
+|* License. See LICENSE.TXT for details.                                      *|
+|*                                                                            *|
+|*===----------------------------------------------------------------------===*|
+|*                                                                            *|
+|* This file contains definitions to figure out the size of _HOST_ data types.*|
+|* This file is important because different host OS's define different macros,*|
+|* which makes portability tough.  This file exports the following            *|
+|* definitions:                                                               *|
+|*                                                                            *|
+|*   [u]int(32|64)_t : typedefs for signed and unsigned 32/64 bit system types*|
+|*   [U]INT(8|16|32|64)_(MIN|MAX) : Constants for the min and max values.     *|
+|*                                                                            *|
+|* No library is required when using these functions.                         *|
+|*                                                                            *|
+|*===----------------------------------------------------------------------===*/
+
+/* Please leave this file C-compatible. */
+
+#ifndef LLVM_C_DATATYPES_H
+#define LLVM_C_DATATYPES_H
+
+#cmakedefine HAVE_INTTYPES_H ${HAVE_INTTYPES_H}
+#cmakedefine HAVE_STDINT_H ${HAVE_STDINT_H}
+#cmakedefine HAVE_UINT64_T ${HAVE_UINT64_T}
+#cmakedefine HAVE_U_INT64_T ${HAVE_U_INT64_T}
+
+#ifdef __cplusplus
+#include <cmath>
+#else
+#include <math.h>
+#endif
+
+#ifdef __cplusplus
+#include <cinttypes>
+#else
+#ifdef HAVE_INTTYPES_H
+#include <inttypes.h>
+#endif
+#endif
+
+#ifdef __cplusplus
+#include <cstdint>
+#else
+#ifdef HAVE_STDINT_H
+#include <stdint.h>
+#else
+#error "Compiler must provide an implementation of stdint.h"
+#endif
+#endif
+
+#ifndef _MSC_VER
+
+#if !defined(UINT32_MAX)
+# error "The standard header <cstdint> is not C++11 compliant. Must #define "\
+        "__STDC_LIMIT_MACROS before #including llvm-c/DataTypes.h"
+#endif
+
+#if !defined(UINT32_C)
+# error "The standard header <cstdint> is not C++11 compliant. Must #define "\
+        "__STDC_CONSTANT_MACROS before #including llvm-c/DataTypes.h"
+#endif
+
+/* Note that <inttypes.h> includes <stdint.h>, if this is a C99 system. */
+#include <sys/types.h>
+
+#ifdef _AIX
+// GCC is strict about defining large constants: they must have LL modifier.
+#undef INT64_MAX
+#undef INT64_MIN
+#endif
+
+/* Handle incorrect definition of uint64_t as u_int64_t */
+#ifndef HAVE_UINT64_T
+#ifdef HAVE_U_INT64_T
+typedef u_int64_t uint64_t;
+#else
+# error "Don't have a definition for uint64_t on this platform"
+#endif
+#endif
+
+#else /* _MSC_VER */
+#ifdef __cplusplus
+#include <cstddef>
+#include <cstdlib>
+#else
+#include <stddef.h>
+#include <stdlib.h>
+#endif
+#include <sys/types.h>
+
+#if defined(_WIN64)
+typedef signed __int64 ssize_t;
+#else
+typedef signed int ssize_t;
+#endif /* _WIN64 */
+
+#ifndef HAVE_INTTYPES_H
+#define PRId64 "I64d"
+#define PRIi64 "I64i"
+#define PRIo64 "I64o"
+#define PRIu64 "I64u"
+#define PRIx64 "I64x"
+#define PRIX64 "I64X"
+
+#define PRId32 "d"
+#define PRIi32 "i"
+#define PRIo32 "o"
+#define PRIu32 "u"
+#define PRIx32 "x"
+#define PRIX32 "X"
+#endif /* HAVE_INTTYPES_H */
+
+#endif /* _MSC_VER */
+
+/* Set defaults for constants which we cannot find. */
+#if !defined(INT64_MAX)
+# define INT64_MAX 9223372036854775807LL
+#endif
+#if !defined(INT64_MIN)
+# define INT64_MIN ((-INT64_MAX)-1)
+#endif
+#if !defined(UINT64_MAX)
+# define UINT64_MAX 0xffffffffffffffffULL
+#endif
+
+#ifndef HUGE_VALF
+#define HUGE_VALF (float)HUGE_VAL
+#endif
+
+#endif /* LLVM_C_DATATYPES_H */
diff --git a/llvm/include/llvm-c/Disassembler.h b/llvm/include/llvm-c/Disassembler.h
index d6f92e5..c2bc6d9 100644
--- a/llvm/include/llvm-c/Disassembler.h
+++ b/llvm/include/llvm-c/Disassembler.h
@@ -15,7 +15,7 @@
 #ifndef LLVM_C_DISASSEMBLER_H
 #define LLVM_C_DISASSEMBLER_H
 
-#include "llvm/Support/DataTypes.h"
+#include "llvm-c/DataTypes.h"
 #ifdef __cplusplus
 #include <cstddef>
 #else
diff --git a/llvm/include/llvm-c/Support.h b/llvm/include/llvm-c/Support.h
index 6de184c..37d5d72 100644
--- a/llvm/include/llvm-c/Support.h
+++ b/llvm/include/llvm-c/Support.h
@@ -14,8 +14,8 @@
 #ifndef LLVM_C_SUPPORT_H
 #define LLVM_C_SUPPORT_H
 
+#include "llvm-c/DataTypes.h"
 #include "llvm-c/Types.h"
-#include "llvm/Support/DataTypes.h"
 
 #ifdef __cplusplus
 extern "C" {
diff --git a/llvm/include/llvm-c/Types.h b/llvm/include/llvm-c/Types.h
index f08610e..1793400 100644
--- a/llvm/include/llvm-c/Types.h
+++ b/llvm/include/llvm-c/Types.h
@@ -14,7 +14,7 @@
 #ifndef LLVM_C_TYPES_H
 #define LLVM_C_TYPES_H
 
-#include "llvm/Support/DataTypes.h"
+#include "llvm-c/DataTypes.h"
 
 #ifdef __cplusplus
 extern "C" {