[Bug target/91498] [10 Regression] STV change in r274481 causes 300.twolf regression on Haswell

[hjl.tools at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91498

--- Comment #7 from H.J. Lu <hjl.tools at gmail dot com> ---
Our SPEC CPU 2017 failed with

 39 util.c:205:1: error: invalid rtl sharing found in the insn
 40   205 | }
 41       | ^
 42 (insn 29 28 3 2 (set (subreg:V2DI (reg:DI 91) 0)
 43         (vec_concat:V2DI (mem/c:DI (plus:DI (reg/f:DI 19 frame)
 44                     (const_int -8 [0xfffffffffffffff8])) [0  S8 A64])
 45             (const_int 0 [0]))) "util.c":134:1 -1
 46      (nil))
 47 util.c:205:1: error: shared rtx
 48 (mem/c:DI (plus:DI (reg/f:DI 19 frame)
 49         (const_int -8 [0xfffffffffffffff8])) [0  S8 A64])
 50 during RTL pass: stv

We have an invalid shared rtx.