Regressions on trunk at revision 262923 vs revision 262879

[H.J. Lu (ia32 -fpic)]

New failures:
FAIL: g++.dg/Walloca1.C  -std=gnu++11  (test for warnings, line 7)
FAIL: g++.dg/Walloca1.C  -std=gnu++14  (test for warnings, line 7)
FAIL: g++.dg/Walloca1.C  -std=gnu++98  (test for warnings, line 7)
FAIL: gcc.dg/Wvla-larger-than-3.c  (test for warnings, line 66)
FAIL: gcc.dg/attr-alloc_size-3.c  (test for warnings, line 403)
FAIL: gcc.dg/attr-alloc_size-3.c  (test for warnings, line 404)
FAIL: gcc.dg/attr-alloc_size-3.c  (test for warnings, line 406)
FAIL: gcc.dg/attr-alloc_size-3.c  (test for warnings, line 407)
FAIL: gcc.dg/attr-alloc_size-3.c  (test for warnings, line 408)
FAIL: gcc.dg/attr-alloc_size-3.c  (test for warnings, line 409)
FAIL: gcc.dg/attr-alloc_size-3.c  (test for warnings, line 410)
FAIL: gcc.dg/attr-alloc_size-3.c  (test for warnings, line 413)
FAIL: gcc.dg/attr-alloc_size-3.c  (test for warnings, line 414)
FAIL: gcc.dg/attr-alloc_size-3.c  (test for warnings, line 416)
FAIL: gcc.dg/attr-alloc_size-3.c  (test for warnings, line 438)
FAIL: gcc.dg/attr-alloc_size-3.c  (test for warnings, line 449)
FAIL: gcc.dg/attr-alloc_size-3.c  (test for warnings, line 453)
FAIL: gcc.dg/attr-alloc_size-3.c  (test for warnings, line 454)
FAIL: gcc.dg/attr-alloc_size-3.c  (test for warnings, line 455)
FAIL: gcc.dg/attr-alloc_size-3.c (test for excess errors)
FAIL: gcc.dg/attr-alloc_size-3.c argument 2 (test for warnings, line 410)
FAIL: gcc.dg/attr-alloc_size-3.c argument 2 (test for warnings, line 455)
FAIL: gcc.dg/pr42611.c  (test for warnings, line 17)

New passes: