Regressions on native/master at commit r15-1646 vs commit r15-1594 on Linux/x86_64

[Haochen Jiang]

Regressions on master at commit r15-1646 vs commit r15-1594 on Linux/x86_64
New failures:
FAIL: gcc.dg/pr10474.c scan-rtl-dump pro_and_epilogue "Performing shrink-wrapping"
FAIL: gcc.target/i386/force-indirect-call-2.c scan-assembler-times (?:call|jmp)[ \\t]+\\*% 3
FAIL: gcc.target/i386/pr63527.c scan-assembler-not movl[ \t]%[^,]+, %ebx
FAIL: gcc.target/i386/pr91384.c scan-assembler-not testl
FAIL: gcc.target/i386/pr91384.c scan-assembler-not testl
FAIL: gcc.target/i386/stack-check-17.c scan-assembler-not pop

New passes:
FAIL: libgomp.c/../libgomp.c-c++-common/for-11.c execution test
FAIL: libgomp.c/../libgomp.c-c++-common/for-14.c execution test
FAIL: libgomp.c/../libgomp.c-c++-common/for-3.c execution test
FAIL: libgomp.c/../libgomp.c-c++-common/for-5.c execution test
FAIL: libgomp.c/../libgomp.c-c++-common/for-6.c execution test