Allow 'CodeGenObjC/illegal-UTF8.m' test for 32-bit targets.

[vvereschaka]

Summary

The 'CodeGenObjC/illegal-UTF8.m' get failed with Clang built with 32-bit targets only (as example ARM-only) with the following error:

error: unable to create target: 'No available targets are compatible with triple "< ... any 64-bit target triple ... >"'

I didn't find any 64-bit dependencies for the test and I think removing '-m64' option should fix the problem and allow this test for any target specified by LLVM_DEFAULT_TARGET_TRIPLE.

[gkistanova]

Thanks for fixing this, Vlad!

cfe/trunk/test/CodeGenObjC/illegal-UTF8.m

-// RUN: %clang %s -S -m64 -o -
+// RUN: %clang %s -S -o -
 
 @class NSString;
 
 
 NSString *S = @"\xff\xff___WAIT___"; // expected-warning {{input conversion stopped due to an input byte that does not belong to the input codeset UTF-8}}