Fix failing buildbots

Fix remaining unittest errors caused by
__attribute__((no_caller_saved_registers))
Related commit which caused the buildbots to fail:
rL352050

llvm-svn: 352060
diff --git a/clang/unittests/AST/StructuralEquivalenceTest.cpp b/clang/unittests/AST/StructuralEquivalenceTest.cpp
index b0748b0..919856f 100644
--- a/clang/unittests/AST/StructuralEquivalenceTest.cpp
+++ b/clang/unittests/AST/StructuralEquivalenceTest.cpp
@@ -378,7 +378,7 @@
   EXPECT_TRUE(testStructuralMatch(t));
 }
 
-// These calling conventions may not be available on certain platforms.
+// These attributes may not be available on certain platforms.
 #if defined(__x86_64__) && defined(__linux__)
 TEST_F(StructuralEquivalenceFunctionTest,
     FunctionsWithDifferentCallingConventions) {
@@ -388,7 +388,6 @@
       Lang_C);
   EXPECT_FALSE(testStructuralMatch(t));
 }
-#endif
 
 TEST_F(StructuralEquivalenceFunctionTest, FunctionsWithDifferentSavedRegsAttr) {
   auto t = makeNamedDecls(
@@ -397,6 +396,7 @@
       Lang_C);
   EXPECT_FALSE(testStructuralMatch(t));
 }
+#endif
 
 struct StructuralEquivalenceCXXMethodTest : StructuralEquivalenceTest {
 };