Hardcode the target in this testcase — it depends on the ABI.
This fixes a failure on Windows buildbots.

llvm-svn: 255919
diff --git a/llvm/test/DebugInfo/X86/reference-argument.ll b/llvm/test/DebugInfo/X86/reference-argument.ll
index 4c09030..0df6ff3 100644
--- a/llvm/test/DebugInfo/X86/reference-argument.ll
+++ b/llvm/test/DebugInfo/X86/reference-argument.ll
@@ -1,4 +1,4 @@
-; RUN: %llc_dwarf -filetype=obj -O0 < %s | llvm-dwarfdump -debug-dump=info - | FileCheck %s
+; RUN: llc -mtriple=x86_64-apple-macosx10.9.0 -filetype=obj -O0 < %s | llvm-dwarfdump -debug-dump=info - | FileCheck %s
 ; ModuleID = 'aggregate-indirect-arg.cpp'
 ; extracted from debuginfo-tests/aggregate-indirect-arg.cpp