[Bug target/60520] stack adjustment are not merged anymore

[hjl.tools at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60520

--- Comment #3 from H.J. Lu <hjl.tools at gmail dot com> ---
With -O -m32 -fno-shrink-wrap, I got

test:
.LFB0:
    .cfi_startproc
    subl    $12, %esp
    .cfi_def_cfa_offset 16
    movl    bar, %eax
    cmpl    $0, (%eax)
    je    .L1
    subl    $12, %esp
    .cfi_def_cfa_offset 28
    pushl    %eax
    .cfi_def_cfa_offset 32
    call    foo
    addl    $16, %esp
    .cfi_def_cfa_offset 16
.L1:
    addl    $12, %esp
    .cfi_def_cfa_offset 4
    ret

shrink-wrap doesn't add epilogue in such a way that stack
adjustment can be easily optimized.