Regressions on trunk at revision 230456 vs revision 230453

[H.J. Lu ia32 -fpic]

New failures:
FAIL: gcc.dg/vect/if-cvt-stores-vect-ifcvt-18.c scan-tree-dump-times vect "vectorized 1 loops" 1

New passes:
FAIL: gcc.target/i386/iamcu/test_passing_floats.c execution,  -O3 -g