Regressions on trunk at revision 253476 vs revision 253472

[H.J. Lu ia32]

New failures:

New passes:
FAIL: gcc.dg/graphite/pr79622.c execution test
FAIL: gfortran.dg/graphite/pr29832.f90   -O0   scan-tree-dump-times graphite "code generation error" 1
FAIL: gfortran.dg/graphite/pr29832.f90   -O1   scan-tree-dump-times graphite "code generation error" 1
FAIL: gfortran.dg/graphite/pr29832.f90   -O2   scan-tree-dump-times graphite "code generation error" 1
FAIL: gfortran.dg/graphite/pr29832.f90   -O3 -fomit-frame-pointer -funroll-loops -fpeel-loops -ftracer -finline-functions   scan-tree-dump-times graphite "code generation error" 1
FAIL: gfortran.dg/graphite/pr29832.f90   -O3 -g   scan-tree-dump-times graphite "code generation error" 1
FAIL: gfortran.dg/graphite/pr29832.f90   -Os   scan-tree-dump-times graphite "code generation error" 1
FAIL: gfortran.dg/graphite/pr42334-1.f   -O   scan-tree-dump-times graphite "code generation error" 1
FAIL: gfortran.dg/graphite/run-id-3.f90   -O1   scan-tree-dump-times graphite "code generation error" 1
FAIL: gfortran.dg/graphite/run-id-3.f90   -Os   scan-tree-dump-times graphite "code generation error" 1