Classify functions by EH personality type rather than using the triple

This mostly reverts commit r222062 and replaces it with a new enum. At
some point this enum will grow at least for other MSVC EH personalities.

Also beefs up the way we were sniffing the personality function.
Previously we would emit the Itanium LSDA despite using
__C_specific_handler.

Reviewers: majnemer

Differential Revision: http://reviews.llvm.org/D6987

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@226920 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/AsmPrinter/DwarfCFIException.cpp

@@ -51,7 +51,8 @@ void DwarfCFIException::endModule() {
   if (moveTypeModule == AsmPrinter::CFI_M_Debug)
     Asm->OutStreamer.EmitCFISections(false, true);
 
-  if (!Asm->MAI->usesItaniumLSDAForExceptions())
+  // SjLj uses this pass and it doesn't need this info.
+  if (!Asm->MAI->usesCFIForEH())
     return;
 
   const TargetLoweringObjectFile &TLOF = Asm->getObjFileLowering();