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

llvm-svn: 123476
diff --git a/llvm/lib/CodeGen/AsmPrinter/DwarfTableException.cpp b/llvm/lib/CodeGen/AsmPrinter/DwarfTableException.cpp
index ccf8f9a..7519011 100644
--- a/llvm/lib/CodeGen/AsmPrinter/DwarfTableException.cpp
+++ b/llvm/lib/CodeGen/AsmPrinter/DwarfTableException.cpp
@@ -277,7 +277,7 @@
 /// EndModule - Emit all exception information that should come after the
 /// content.
 void DwarfTableException::EndModule() {
-  if (Asm->MAI->getExceptionHandlingType() != ExceptionHandling::Dwarf)
+  if (!Asm->MAI->isExceptionHandlingDwarf())
     return;
 
   if (!shouldEmitMovesModule && !shouldEmitTableModule)