Regressions on trunk at revision 240573 vs revision 240557

[H.J. Lu ia32 Core i7]

New failures:
FAIL: gcc.c-torture/execute/builtins/strchr.c execution,  -O1 
FAIL: gcc.c-torture/execute/builtins/strchr.c execution,  -O2 
FAIL: gcc.c-torture/execute/builtins/strchr.c execution,  -O2 -flto -fno-use-linker-plugin -flto-partition=none 
FAIL: gcc.c-torture/execute/builtins/strchr.c execution,  -O2 -flto -fuse-linker-plugin -fno-fat-lto-objects 
FAIL: gcc.c-torture/execute/builtins/strchr.c execution,  -O3 -g 
FAIL: gcc.c-torture/execute/builtins/strchr.c execution,  -Og -g 
FAIL: gcc.c-torture/execute/builtins/strchr.c execution,  -Os 
FAIL: g++.dg/ext/builtin10.C  -std=gnu++11  scan-tree-dump-not optimized "strchr"
FAIL: g++.dg/ext/builtin10.C  -std=gnu++14  scan-tree-dump-not optimized "strchr"
FAIL: g++.dg/ext/builtin10.C  -std=gnu++98  scan-tree-dump-not optimized "strchr"

New passes: