Regressions on trunk at revision 231784 vs revision 231746

[H.J. Lu Intel64 -fpic -mcmodel=medium -mcmodel=large]

New failures:
FAIL: boehm-gc.c/gctest.c -O2 execution test
FAIL: gcc.dg/graphite/fuse-1.c scan-tree-dump-times graphite "AST generated by isl:.*for \\(int c0 = 0; c0 <= 99; c0 \\+= 1\\) {.*S_.*\\(c0\\);.*S_.*\\(c0\\);.*S_.*\\(c0\\);.*}" 1
FAIL: gcc.dg/graphite/fuse-1.c scan-tree-dump-times graphite "AST generated by isl:.*for \\(int c0 = 0; c0 <= 99; c0 \\+= 1\\) {.*S_.*\\(c0\\);.*S_.*\\(c0\\);.*S_.*\\(c0\\);.*}" 1
FAIL: gcc.dg/graphite/fuse-1.c scan-tree-dump-times graphite "AST generated by isl:.*for \\(int c0 = 0; c0 <= 99; c0 \\+= 1\\) {.*S_.*\\(c0\\);.*S_.*\\(c0\\);.*S_.*\\(c0\\);.*}" 1
FAIL: gcc.dg/graphite/fuse-2.c scan-tree-dump-times graphite "AST generated by isl:.*for \\(int c0 = 0; c0 <= 99; c0 \\+= 1\\) {.*S_.*\\(c0\\);.*S_.*\\(c0\\);.*S_.*\\(c0\\);.*}" 1
FAIL: gcc.dg/graphite/fuse-2.c scan-tree-dump-times graphite "AST generated by isl:.*for \\(int c0 = 0; c0 <= 99; c0 \\+= 1\\) {.*S_.*\\(c0\\);.*S_.*\\(c0\\);.*S_.*\\(c0\\);.*}" 1
FAIL: gcc.dg/graphite/fuse-2.c scan-tree-dump-times graphite "AST generated by isl:.*for \\(int c0 = 0; c0 <= 99; c0 \\+= 1\\) {.*S_.*\\(c0\\);.*S_.*\\(c0\\);.*S_.*\\(c0\\);.*}" 1

New passes:
FAIL: gcc.dg/graphite/fuse-1.c scan-tree-dump-times graphite "ISL AST generated by ISL:.*for \\(int c0 = 0; c0 <= 99; c0 \\+= 1\\) {.*S_.*\\(c0\\);.*S_.*\\(c0\\);.*S_.*\\(c0\\);.*}" 1
FAIL: gcc.dg/graphite/fuse-1.c scan-tree-dump-times graphite "ISL AST generated by ISL:.*for \\(int c0 = 0; c0 <= 99; c0 \\+= 1\\) {.*S_.*\\(c0\\);.*S_.*\\(c0\\);.*S_.*\\(c0\\);.*}" 1
FAIL: gcc.dg/graphite/fuse-1.c scan-tree-dump-times graphite "ISL AST generated by ISL:.*for \\(int c0 = 0; c0 <= 99; c0 \\+= 1\\) {.*S_.*\\(c0\\);.*S_.*\\(c0\\);.*S_.*\\(c0\\);.*}" 1
FAIL: gcc.dg/graphite/fuse-2.c scan-tree-dump-times graphite "ISL AST generated by ISL:.*for \\(int c0 = 0; c0 <= 99; c0 \\+= 1\\) {.*S_.*\\(c0\\);.*S_.*\\(c0\\);.*S_.*\\(c0\\);.*}" 1
FAIL: gcc.dg/graphite/fuse-2.c scan-tree-dump-times graphite "ISL AST generated by ISL:.*for \\(int c0 = 0; c0 <= 99; c0 \\+= 1\\) {.*S_.*\\(c0\\);.*S_.*\\(c0\\);.*S_.*\\(c0\\);.*}" 1
FAIL: gcc.dg/graphite/fuse-2.c scan-tree-dump-times graphite "ISL AST generated by ISL:.*for \\(int c0 = 0; c0 <= 99; c0 \\+= 1\\) {.*S_.*\\(c0\\);.*S_.*\\(c0\\);.*S_.*\\(c0\\);.*}" 1