Reapply my previous asmprinter changes now with more testing and two

additional bug fixes:

1. The bug that everyone hit was a problem in the asmprinter where it
   would remove $stub but keep the L prefix on a name when emitting the
   indirect symbol.  This is easy to fix by keeping the name of the stub
   and the name of the symbol in a StringMap instead of just keeping a
   StringSet and trying to reconstruct it late.

2. There was a problem printing the personality function.  The current
   logic to print out the personality function from the DWARF information
   is a bit of a cesspool right now that duplicates a bunch of other 
   logic in the asm printer.  The short version of it is that it depends
   on emitting both the L and _ prefix for symbols (at least on darwin)
   and until I can untangle it, it is best to switch the mangler back to
   emitting both prefixes.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@75646 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/CBackend/CBackend.cpp

@@ -1432,7 +1432,7 @@ void CWriter::printConstantWithCast(Constant* CPV, unsigned Opcode) {
 std::string CWriter::GetValueName(const Value *Operand) {
   // Mangle globals with the standard mangler interface for LLC compatibility.
   if (const GlobalValue *GV = dyn_cast<GlobalValue>(Operand))
-    return Mang->getValueName(GV);
+    return Mang->getMangledName(GV);
     
   std::string Name = Operand->getName();