simd_cmp_impl,TestSimd*Arg: break on failure
simd_cmp_impl,TestSimd*Arg: break on failure

check for googletest failures as well as mismatches. this greatly
reduces the error output and time to failure.

BUG=aomedia:371

Change-Id: Ic617905430a8ec39fbee2af9ce6655a8ef6796c0

smarter/aom,luctrudeau/aom,luctrudeau/aom,GrokImageCompression/aom,luctrudeau/aom,luctrudeau/aom,smarter/aom,GrokImageCompression/aom,luctrudeau/aom,GrokImageCompression/aom,GrokImageCompression/aom,smarter/aom,GrokImageCompression/aom,smarter/aom,luctrudeau/aom,smarter/aom,smarter/aom,GrokImageCompression/aom