Regressions on trunk at revision 181300 vs revision 181296

[H.J. Lu Intel64 Core 2/i7]

New failures:

New passes:
FAIL: gcc.dg/tree-ssa/stdarg-2.c scan-tree-dump stdarg "f11: va_list escapes 0, needs to save (3|12|24) GPR units"
FAIL: gcc.dg/tree-ssa/stdarg-2.c scan-tree-dump stdarg "f12: va_list escapes 0, needs to save [1-9][0-9]* GPR units"
FAIL: gcc.dg/tree-ssa/stdarg-2.c scan-tree-dump stdarg "f13: va_list escapes 0, needs to save [1-9][0-9]* GPR units"
FAIL: gcc.dg/tree-ssa/stdarg-2.c scan-tree-dump stdarg "f14: va_list escapes 0, needs to save [1-9][0-9]* GPR units"
FAIL: gcc.dg/tree-ssa/stdarg-2.c scan-tree-dump stdarg "f1: va_list escapes 0, needs to save 0 GPR units"
FAIL: gcc.dg/tree-ssa/stdarg-2.c scan-tree-dump stdarg "f2: va_list escapes 0, needs to save [148] GPR units"
FAIL: gcc.dg/tree-ssa/stdarg-2.c scan-tree-dump stdarg "f3: va_list escapes 0, needs to save [1-9][0-9]* GPR units"
FAIL: gcc.dg/tree-ssa/stdarg-2.c scan-tree-dump stdarg "f6: va_list escapes 0, needs to save (3|12|24) GPR units"
FAIL: gcc.dg/tree-ssa/stdarg-4.c scan-tree-dump stdarg "f3: va_list escapes 0, needs to save [148] GPR units"
FAIL: gcc.dg/tree-ssa/stdarg-4.c scan-tree-dump stdarg "f4: va_list escapes 0, needs to save [148] GPR units"
FAIL: gcc.target/i386/avx-vzeroupper-14.c scan-assembler-times avx_vzeroupper 1
FAIL: gcc.target/i386/avx-vzeroupper-14.c scan-assembler-times avx_vzeroupper 1