Use an Itanium triple in DWARF debug info tests

This should fix the clang part of the breakage in r200340.

llvm-svn: 200435
diff --git a/clang/test/CodeGenCXX/debug-info-ctor2.cpp b/clang/test/CodeGenCXX/debug-info-ctor2.cpp
index 19bd64b..3bc931e 100644
--- a/clang/test/CodeGenCXX/debug-info-ctor2.cpp
+++ b/clang/test/CodeGenCXX/debug-info-ctor2.cpp
@@ -1,4 +1,5 @@
-// RUN: %clang -fverbose-asm -g -S %s -o - | grep AT_explicit
+// FIXME: Check IR rather than asm, then triple is not needed.
+// RUN: %clang -Xclang -triple=%itanium_abi_triple -fverbose-asm -g -S %s -o - | grep AT_explicit
 
 
 class MyClass