Add a possibility to switch between CFI directives- and table-based frame description emission. Currently all the backends use table-based stuff.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123476 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/PowerPC/PPCMCAsmInfo.cpp b/lib/Target/PowerPC/PPCMCAsmInfo.cpp
index 3b766b0..d1178dd 100644
--- a/lib/Target/PowerPC/PPCMCAsmInfo.cpp
+++ b/lib/Target/PowerPC/PPCMCAsmInfo.cpp
@@ -17,7 +17,7 @@
 PPCMCAsmInfoDarwin::PPCMCAsmInfoDarwin(bool is64Bit) {
   PCSymbol = ".";
   CommentString = ";";
-  ExceptionsType = ExceptionHandling::Dwarf;
+  ExceptionsType = ExceptionHandling::DwarfTable;
 
   if (!is64Bit)
     Data64bitsDirective = 0;      // We can't emit a 64-bit unit in PPC32 mode.
@@ -48,7 +48,7 @@
 
   // Exceptions handling
   if (!is64Bit)
-    ExceptionsType = ExceptionHandling::Dwarf;
+    ExceptionsType = ExceptionHandling::DwarfTable;
     
   ZeroDirective = "\t.space\t";
   Data64bitsDirective = is64Bit ? "\t.quad\t" : 0;