Regressions on trunk at revision 255849 vs revision 255832

[H.J. Lu x32 -fpic]

New failures:
FAIL: gcc.dg/Wstringop-overflow.c  (test for warnings, line 100)
FAIL: gcc.dg/Wstringop-overflow.c  (test for warnings, line 101)
FAIL: gcc.dg/Wstringop-overflow.c  (test for warnings, line 102)
FAIL: gcc.dg/Wstringop-overflow.c  (test for warnings, line 104)
FAIL: gcc.dg/Wstringop-overflow.c  (test for warnings, line 105)
FAIL: gcc.dg/Wstringop-overflow.c  (test for warnings, line 106)
FAIL: gcc.dg/Wstringop-overflow.c  (test for warnings, line 124)
FAIL: gcc.dg/Wstringop-overflow.c  (test for warnings, line 125)
FAIL: gcc.dg/Wstringop-overflow.c  (test for warnings, line 126)
FAIL: gcc.dg/Wstringop-overflow.c  (test for warnings, line 127)
FAIL: gcc.dg/Wstringop-overflow.c  (test for warnings, line 128)
FAIL: gcc.dg/Wstringop-overflow.c  (test for warnings, line 130)
FAIL: gcc.dg/Wstringop-overflow.c  (test for warnings, line 131)
FAIL: gcc.dg/Wstringop-overflow.c  (test for warnings, line 47)
FAIL: gcc.dg/Wstringop-overflow.c  (test for warnings, line 48)
FAIL: gcc.dg/Wstringop-overflow.c  (test for warnings, line 49)
FAIL: gcc.dg/Wstringop-overflow.c  (test for warnings, line 50)
FAIL: gcc.dg/Wstringop-overflow.c  (test for warnings, line 51)
FAIL: gcc.dg/Wstringop-overflow.c  (test for warnings, line 53)
FAIL: gcc.dg/Wstringop-overflow.c  (test for warnings, line 54)
FAIL: gcc.dg/Wstringop-overflow.c  (test for warnings, line 55)
FAIL: gcc.dg/Wstringop-overflow.c  (test for warnings, line 98)
FAIL: gcc.dg/Wstringop-overflow.c  (test for warnings, line 99)

New passes:
FAIL: gcc.dg/graphite/pr70045.c (internal compiler error)
FAIL: gcc.dg/graphite/pr70045.c (test for excess errors)
FAIL: gcc.dg/pr82975.c (test for excess errors)