Investigate gcc-target-test failures
Follow up from #712

Current fail list
```
# these fail on x86 and arm
pr88240.c.gcc-target-test-64
sse2-mmx-cvtps2pi.c.gcc-target-test-64
sse2-mmx-cvttps2pi.c.gcc-target-test-64
sse2-mmx-pextrw.c.gcc-target-test-64
sse2-mmx-psraw.c.gcc-target-test-64
sse2-mmx-psrawi.c.gcc-target-test-64
sse2-psraw-1.c.gcc-target-test-64
sse2-shiftqihi-constant-2.c.gcc-target-test-64

# these fail on arm
sse2-mmx-pslld.c.gcc-target-test-64
sse2-mmx-psllq.c.gcc-target-test-64
sse2-mmx-psllw.c.gcc-target-test-64
sse2-mmx-psrad.c.gcc-target-test-64
sse2-mmx-psrld.c.gcc-target-test-64
sse2-mmx-psrlq.c.gcc-target-test-64
sse2-mmx-psrlw.c.gcc-target-test-64
```