[ASTImporter] Fix up test that only works on X86.

The test will fail if the default target triple is not X86,
even if the host platform is. So move the check into the
test at runtime.

llvm-svn: 352956

Author: davemgreen

clang/unittests/AST/StructuralEquivalenceTest.cpp

@@ -378,10 +378,12 @@ TEST_F(StructuralEquivalenceFunctionTest, FunctionsWithDifferentNoreturnAttr) {
   EXPECT_TRUE(testStructuralMatch(t));
 }
 
-// These attributes may not be available on certain platforms.
-#if defined(__x86_64__) && defined(__linux__)
 TEST_F(StructuralEquivalenceFunctionTest,
     FunctionsWithDifferentCallingConventions) {
+  // These attributes may not be available on certain platforms.
+  if (llvm::Triple(llvm::sys::getDefaultTargetTriple()).getArch() !=
+      llvm::Triple::x86_64)
+    return;
   auto t = makeNamedDecls(
       "__attribute__((preserve_all)) void foo();",
       "__attribute__((ms_abi))   void foo();",
@@ -390,13 +392,15 @@ TEST_F(StructuralEquivalenceFunctionTest,
 }
 
 TEST_F(StructuralEquivalenceFunctionTest, FunctionsWithDifferentSavedRegsAttr) {
+  if (llvm::Triple(llvm::sys::getDefaultTargetTriple()).getArch() !=
+      llvm::Triple::x86_64)
+    return;
   auto t = makeNamedDecls(
       "__attribute__((no_caller_saved_registers)) void foo();",
       "                                           void foo();",
       Lang_C);
   EXPECT_FALSE(testStructuralMatch(t));
 }
-#endif
 
 struct StructuralEquivalenceCXXMethodTest : StructuralEquivalenceTest {
 };