[CMake] Move CLANG_ENABLE_(ARCMT|OBJC_REWRITER|STATIC_ANALYZER) into clang/Config/config.h.

LLVM_ENABLE_MODULES is sensitive of -D. Move them into config.h.

FIXME: It'd be better that they are #cmakedefine01 rather than #cmakedefine.
(#if FOO rather than #if defined(FOO))
Then we can find missing #include "clang/Config/config.h" in the future.

Differential Revision: https://reviews.llvm.org/D35527

llvm-svn: 308277
diff --git a/clang/tools/libclang/ARCMigrate.cpp b/clang/tools/libclang/ARCMigrate.cpp
index 44a60c4..0f2bd06 100644
--- a/clang/tools/libclang/ARCMigrate.cpp
+++ b/clang/tools/libclang/ARCMigrate.cpp
@@ -14,6 +14,7 @@
 #include "clang-c/Index.h"
 #include "CXString.h"
 #include "clang/ARCMigrate/ARCMT.h"
+#include "clang/Config/config.h"
 #include "clang/Frontend/TextDiagnosticBuffer.h"
 #include "llvm/Support/FileSystem.h"