Regressions on trunk at revision 172467 vs revision 172431

[H.J. Lu Intel AVX]

New failures:

New passes:
FAIL: gcc.target/x86_64/abi/avx/test_passing_m256.c execution,  -O0 
FAIL: gcc.target/x86_64/abi/avx/test_passing_m256.c execution,  -O1 
FAIL: gcc.target/x86_64/abi/avx/test_passing_m256.c execution,  -O2 
FAIL: gcc.target/x86_64/abi/avx/test_passing_m256.c execution,  -O3 -fomit-frame-pointer 
FAIL: gcc.target/x86_64/abi/avx/test_passing_m256.c execution,  -O3 -fomit-frame-pointer -funroll-all-loops -finline-functions 
FAIL: gcc.target/x86_64/abi/avx/test_passing_m256.c execution,  -O3 -fomit-frame-pointer -funroll-loops 
FAIL: gcc.target/x86_64/abi/avx/test_passing_m256.c execution,  -O3 -g 
FAIL: gcc.target/x86_64/abi/avx/test_passing_m256.c execution,  -Os 
FAIL: gcc.target/x86_64/abi/avx/test_passing_structs.c execution,  -O0 
FAIL: gcc.target/x86_64/abi/avx/test_passing_structs.c execution,  -O1 
FAIL: gcc.target/x86_64/abi/avx/test_passing_structs.c execution,  -O2 
FAIL: gcc.target/x86_64/abi/avx/test_passing_structs.c execution,  -Os