test/Modules/compiler_builtins.m: Mark this as XFAIL:win32. MS limits.h provides size_t.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@149499 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Modules/compiler_builtins.m b/test/Modules/compiler_builtins.m
index d5b58b0..63d9f95 100644
--- a/test/Modules/compiler_builtins.m
+++ b/test/Modules/compiler_builtins.m
@@ -9,6 +9,8 @@
 
 char getCharMax() { return CHAR_MAX; }
 
+// MS limits.h provides size_t.
+// XFAIL: win32
 size_t size; // expected-error{{unknown type name 'size_t'}}
 
 @import _Builtin_stdlib.stdint;