re PR bootstrap/49964 (Bootstrap failed with AVX turned on)

re PR bootstrap/49964 (Bootstrap failed with AVX turned on)

PR target/49964
        * config/i386/i386.c (ix86_expand_call): Don't create nested
        PARALLELs for TARGET_VZEROUPPER.
        (ix86_split_call_vzeroupper): Fix extraction of the original call.
        * config/i386/i386.md (*call_rex64_ms_sysv_vzeroupper): Don't
        recognize nested PARALLELs.
        (*call_pop_vzeroupper, *sibcall_pop_vzeroupper,
        *call_value_rex64_ms_sysv_vzeroupper, *call_value_pop_vzeroupper,
        *sibcall_value_pop_vzeroupper): Likewise.

From-SVN: r177408