clang/test/CodeGenCXX/debug-info-static-member.cpp: Appease targetting msvc to add explicit -target x86_64-unknown-unknown.

with -target i686-win32, you will see;

debug-info-static-member.cpp:11:22: error: in-class initializer for static data member of type 'const float' requires 'constexpr' specifier [-Wstatic-float-init]
  const static float const_b = 3.14;
                     ^         ~~~~
  constexpr

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@173418 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/CodeGenCXX/debug-info-static-member.cpp b/test/CodeGenCXX/debug-info-static-member.cpp
index 953db58..774f7b1 100644
--- a/test/CodeGenCXX/debug-info-static-member.cpp
+++ b/test/CodeGenCXX/debug-info-static-member.cpp
@@ -1,4 +1,4 @@
-// RUN: %clangxx -g -O0 %s -emit-llvm -S -o - | FileCheck %s
+// RUN: %clangxx -target x86_64-unknown-unknown -g -O0 %s -emit-llvm -S -o - | FileCheck %s
 // PR14471