[Bug middle-end/96192] New: tree-inline.c(copy_decl_for_dup_finish) should preserve decl alignment in copy

[skpgkp2 at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96192

            Bug ID: 96192
           Summary: tree-inline.c(copy_decl_for_dup_finish) should
                    preserve decl alignment in copy
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
          Assignee: unassigned at gcc dot gnu.org
          Reporter: skpgkp2 at gmail dot com
                CC: hjl.tools at gmail dot com
  Target Milestone: ---
            Target: x86_64-*-* i?86-*-*

tree-inline.c function copy_decl_for_dup_finish should preserve local decl
alignment in copy.

This issue appears when local decl alignment get lowered by target hook, but
during the inline, copy may get different alignment than original decl.

This blocks PR95237.

Test case:

$ cat foo.c
int a;

long long 
b (void)
{
}

void
c (void)
{
  if (b())
    a = 1;
}

$gcc -m32 -mpreferred-stack-boundary=2 -Os -c foo.c
during GIMPLE pass: adjust_alignment
foo.c: In function ??c??:
foo.c:12:1: internal compiler error: in execute, at adjust-alignment.c:74
   12 | c (void)
      | ^
0x20bc351 execute
        /local/skpandey/gccwork/gccwork/pr95237_1/gcc/adjust-alignment.c:74
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