[PATCH] Fix "-mno-global-merge" option for clang

[Steven Wu]

This patch fixes the problem in clang after llvm changes the option for global-merge in r210639. When using “-mno-global-merge”, clang will return following error currently:
clang: Unknown command line argument '-global-merge=false'.  Try: 'clang -help'
clang: Did you mean '-enable-global-merge=false’?
This patch should fix this problem.

I try to add a test case but it is not very obvious because there are no current examples for backend options. I add two tests in mno-global-merge.c to make sure it actually runs. If anyone has better idea how to handle this, please let me know.

I don’t have permission to commit the patch. Please help me to commit after review. 

Thanks

Steven
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