[Bug target/114595] rtl-expand emit redundant store for bitwise-and expression

[absoler at smail dot nju.edu.cn via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114595

--- Comment #1 from absoler at smail dot nju.edu.cn ---
gcc-4's result:
```
func_1():
        movl    g1(%rip), %eax
        andl    $1, %eax
        movb    %al, g2(%rip)
        movl    %eax, g3(%rip)
        ret
```