[Bug c/90106] builtin sqrt() ignoring libm's sqrt call result

[fredericopissarra at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90106

--- Comment #5 from Frederico Lamberti Pissarra <fredericopissarra at gmail dot 
com> ---
CLANG 6 creates a similar code:

  f:
    xorps %xmm1,%xmm1
    ucomiss %xmm1,%xmm0
    jb .L8   # more intutive test...
    sqrtss
    ret
  .L8:
    jmp sqrtf@PLT