For the 'C' disassembler API, add a new ReferenceType for the

SymbolLookUp() call back to return a demangled C++ name to
be used as a comment.

For example darwin's otool(1) program the uses the llvm
disassembler now can produce disassembly like:

callq   __ZNK4llvm6Target20createMCDisassemblerERKNS_15MCSubtargetInfoE ## llvm::Target::createMCDisassembler(llvm::MCSubtargetInfo const&) const

Also fix a bug in LLVMDisasmInstruction() that was not flushing
the raw_svector_ostream for the disassembled instruction string
before copying it to the output buffer that was causing truncation
of the output.

rdar://10173828

llvm-svn: 198637

llvm/include/llvm-c/Disassembler.h

@@ -141,6 +141,9 @@ typedef const char *(*LLVMSymbolLookupCallback)(void *DisInfo,
 /* The output reference is to a Objective-C class ref. */
 #define LLVMDisassembler_ReferenceType_Out_Objc_Class_Ref 8
 
+/* The output reference is to a C++ symbol name. */
+#define LLVMDisassembler_ReferenceType_DeMangled_Name 9
+
 #ifdef __cplusplus
 extern "C" {
 #endif /* !defined(__cplusplus) */