Fix warnings generated by clang-cl.

There were a couple of real bugs here regarding error checking and
signed/unsigned comparisons, but mostly these were just noise.

There was one class of bugs fixed here which is particularly
annoying, dealing with MSVC's non-standard behavior regarding
the underlying type of enums.  See the comment in
lldb-enumerations.h for details.  In short, from now on please use
FLAGS_ENUM and FLAGS_ANONYMOUS_ENUM when defining enums which
contain values larger than can fit into a signed integer.

llvm-svn: 233943
diff --git a/lldb/source/Symbol/CompactUnwindInfo.cpp b/lldb/source/Symbol/CompactUnwindInfo.cpp
index ae99f30..17a4a99 100644
--- a/lldb/source/Symbol/CompactUnwindInfo.cpp
+++ b/lldb/source/Symbol/CompactUnwindInfo.cpp
@@ -35,13 +35,15 @@
 
     // Constants from <mach-o/compact_unwind_encoding.h>
 
-    enum {
+    FLAGS_ANONYMOUS_ENUM()
+    {
         UNWIND_IS_NOT_FUNCTION_START           = 0x80000000,
         UNWIND_HAS_LSDA                        = 0x40000000,
         UNWIND_PERSONALITY_MASK                = 0x30000000,
     };
 
-    enum {
+    FLAGS_ANONYMOUS_ENUM()
+    {
         UNWIND_X86_MODE_MASK                         = 0x0F000000,
         UNWIND_X86_MODE_EBP_FRAME                    = 0x01000000,
         UNWIND_X86_MODE_STACK_IMMD                   = 0x02000000,
@@ -59,7 +61,8 @@
         UNWIND_X86_DWARF_SECTION_OFFSET              = 0x00FFFFFF,
     };
 
-    enum {
+    enum
+    {
         UNWIND_X86_REG_NONE     = 0,
         UNWIND_X86_REG_EBX      = 1,
         UNWIND_X86_REG_ECX      = 2,
@@ -68,7 +71,9 @@
         UNWIND_X86_REG_ESI      = 5,
         UNWIND_X86_REG_EBP      = 6,
     };
-    enum {
+
+    FLAGS_ANONYMOUS_ENUM()
+    {
         UNWIND_X86_64_MODE_MASK                         = 0x0F000000,
         UNWIND_X86_64_MODE_RBP_FRAME                    = 0x01000000,
         UNWIND_X86_64_MODE_STACK_IMMD                   = 0x02000000,
@@ -86,7 +91,8 @@
         UNWIND_X86_64_DWARF_SECTION_OFFSET              = 0x00FFFFFF,
     };
 
-    enum {
+    enum
+    {
         UNWIND_X86_64_REG_NONE       = 0,
         UNWIND_X86_64_REG_RBX        = 1,
         UNWIND_X86_64_REG_R12        = 2,