-finstrument-functions leads to unsats to _mm instrinsic wrappers

[Xinliang David Li]

Build the test case in the patch file with -finstrument-functions, the
link will fail with unsat. The problem is gcc instruments the
artificial wrappers that will won't be emitted. The patch fixes the
problem. Bootstrap and tested on x86-64/linux.

Ok for mainline?

thanks,

David
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