Regressions on master at commit r11-4722 vs commit r11-4668 on Linux/x86_64

[H.J. Lu]

New failures:

New passes:
FAIL: gcc.dg/vect/costmodel/x86_64/costmodel-pr30843.c scan-tree-dump-times vect "# vect_vec_iv" 1
FAIL: libgomp.fortran/examples-4/simd-2.f90   -O1  (internal compiler error)
FAIL: libgomp.fortran/examples-4/simd-2.f90   -O1  (internal compiler error)
FAIL: libgomp.fortran/examples-4/simd-2.f90   -O1  (test for excess errors)
FAIL: libgomp.fortran/examples-4/simd-2.f90   -O1  (test for excess errors)
FAIL: libgomp.fortran/examples-4/simd-2.f90   -O2  (internal compiler error)
FAIL: libgomp.fortran/examples-4/simd-2.f90   -O2  (internal compiler error)
FAIL: libgomp.fortran/examples-4/simd-2.f90   -O2  (test for excess errors)
FAIL: libgomp.fortran/examples-4/simd-2.f90   -O2  (test for excess errors)
FAIL: libgomp.fortran/examples-4/simd-2.f90   -O3 -fomit-frame-pointer -funroll-loops -fpeel-loops -ftracer -finline-functions  (internal compiler error)
FAIL: libgomp.fortran/examples-4/simd-2.f90   -O3 -fomit-frame-pointer -funroll-loops -fpeel-loops -ftracer -finline-functions  (internal compiler error)
FAIL: libgomp.fortran/examples-4/simd-2.f90   -O3 -fomit-frame-pointer -funroll-loops -fpeel-loops -ftracer -finline-functions  (test for excess errors)
FAIL: libgomp.fortran/examples-4/simd-2.f90   -O3 -fomit-frame-pointer -funroll-loops -fpeel-loops -ftracer -finline-functions  (test for excess errors)
FAIL: libgomp.fortran/examples-4/simd-2.f90   -O3 -g  (internal compiler error)
FAIL: libgomp.fortran/examples-4/simd-2.f90   -O3 -g  (internal compiler error)
FAIL: libgomp.fortran/examples-4/simd-2.f90   -O3 -g  (test for excess errors)
FAIL: libgomp.fortran/examples-4/simd-2.f90   -O3 -g  (test for excess errors)
FAIL: libgomp.fortran/examples-4/simd-2.f90   -Os  (internal compiler error)
FAIL: libgomp.fortran/examples-4/simd-2.f90   -Os  (internal compiler error)
FAIL: libgomp.fortran/examples-4/simd-2.f90   -Os  (test for excess errors)
FAIL: libgomp.fortran/examples-4/simd-2.f90   -Os  (test for excess errors)