[Bug rtl-optimization/66152] suboptimal load bytes to stack

[SztfG at yandex dot ru]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66152

--- Comment #4 from SztfG at yandex dot ru ---
GCC from trunk doing this:

.Ltext0:
.LC0:
  .string ""
  .ascii "\001\002\003\004\005\006\007"
bar:
.LFB0:
  sub rsp, 24
  mov rax, QWORD PTR .LC0[rip]
  lea rdi, [rsp+8]
  mov QWORD PTR [rsp+8], rax
  call foo
.LVL0:
  add rsp, 24
  ret
.LFE0:

instead movabsq $506097522914230528, %rax