[Bug bootstrap/69123] [6 Regression] --with-build-config='bootstrap-O3 bootstrap-debug' miscompiled stage 2

[hjl.tools at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69123

--- Comment #9 from H.J. Lu <hjl.tools at gmail dot com> ---
(insn:TI 248 289 246 8 (set (reg:V2DI 21 xmm0 [130])
        (mem/c:V2DI (plus:DI (reg/f:DI 7 sp)
                (const_int 16 [0x10])) [9 %sfp+-32 S16 A128])) /tmp/x.ii:24
1215 {*movv2di_internal}
     (nil))
...
(insn:TI 250 118 120 9 (set (mem/c:DI (plus:DI (reg/f:DI 7 sp)
                (const_int 16 [0x10])) [9 %sfp+-32 S8 A128])
        (reg/v/f:DI 0 ax [orig:120 base ] [120])) /tmp/x.ii:33 85
{*movdi_internal}
     (nil))

seem to confuse canonicalize_values_star and lead to infinite loop.