[Bug bootstrap/66978] [6 Regression] bootstrap failure with --with-multilib-list=m32,m64,mx32

["hjl.tools at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66978

--- Comment #3 from H.J. Lu <hjl.tools at gmail dot com> ---
A small testcase:

[hjl@gnu-6 pr66978]$ cat x.i
extern int foo (int *);
int
bar (int *p)
{
  __attribute__ ((noinline, noclone))
  int hack_digit (void)
    {
      return foo (p);
    }
  return hack_digit ();
}
[hjl@gnu-6 pr66978]$ make
/export/build/gnu/gcc/build-x86_64-linux/gcc/xgcc
-B/export/build/gnu/gcc/build-x86_64-linux/gcc/ -O2 -mx32 -maddress-mode=short
-S -o x.s x.i
x.i: In function \u2018hack_digit\u2019:
x.i:6:7: internal compiler error: in emit_move_insn, at expr.c:3552
   int hack_digit (void)
       ^
0x9d9caf emit_move_insn(rtx_def*, rtx_def*)
        /export/gnu/import/git/sources/gcc/gcc/expr.c:3551
0xa55586 expand_function_start(tree_node*)
        /export/gnu/import/git/sources/gcc/gcc/function.c:5210
0x8ae9da execute
        /export/gnu/import/git/sources/gcc/gcc/cfgexpand.c:6105
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://gcc.gnu.org/bugs.html> for instructions.
Makefile:15: recipe for target 'x.s' failed
make: *** [x.s] Error 1
[hjl@gnu-6 pr66978]$