[sanitizers] Make sure TSan tests do not run on 32 bit platforms.

Author: AnnaZaks

test/IRGen/sanitizer-attributes.swift renamed to test/IRGen/asan-attributes.swift

@@ -1,12 +1,10 @@
-// This test verifies that we add the function attributes used by sanitizers.
+// This test verifies that we add the function attributes used by ASan.
 
 // RUN: %target-swift-frontend -emit-ir -sanitize=address %s | FileCheck %s -check-prefix=ASAN
-// RUN: %target-swift-frontend -emit-ir -target x86_64-apple-macosx10.9 -sanitize=thread %s | FileCheck %s -check-prefix=TSAN
 
 // XFAIL: linux
 
 func test() {
 }
 
 // ASAN: Function Attrs: sanitize_address
-// TSAN: Function Attrs: sanitize_thread

test/IRGen/tsan-attributes.swift

@@ -0,0 +1,12 @@
+// This test verifies that we add the function attributes used by TSan.
+
+// RUN: %target-swift-frontend -emit-ir -sanitize=thread %s | FileCheck %s -check-prefix=TSAN
+
+// TSan is currently only supported on 64 bit mac and simulators.
+// (We do not test the simulators here.)
+// REQUIRES: CPU=x86_64, OS=macosx
+
+func test() {
+}
+
+// TSAN: Function Attrs: sanitize_thread