Add an "msasm" flag to inline asm as suggested in PR 5125.

A little ugliness is accepted to keep the binary file format
compatible.  No functional change yet.

llvm-svn: 84020

llvm/lib/Bitcode/Writer/BitcodeWriter.cpp

@@ -679,7 +679,8 @@ static void WriteConstants(unsigned FirstVal, unsigned LastVal,
     }
 
     if (const InlineAsm *IA = dyn_cast<InlineAsm>(V)) {
-      Record.push_back(unsigned(IA->hasSideEffects()));
+      Record.push_back(unsigned(IA->hasSideEffects()) |
+                       unsigned(IA->isMsAsm()) << 1);
 
       // Add the asm string.
       const std::string &AsmStr = IA->getAsmString();