Fix some i386 testcases for -frename-registers

[Uros Bizjak]

Hello!

> * gcc.target/i386/avx512bw-vptestmb-1.c: Correct [xyz]mm register
> number scans.
> * gcc.target/i386/avx512bw-vptestmw-1.c: Likewise.
> * gcc.target/i386/avx512bw-vptestnmb-1.c: Likewise.
> * gcc.target/i386/avx512bw-vptestnmw-1.c: Likewise.
> * gcc.target/i386/avx512cd-vpbroadcastmb2q-1.c: Likewise.
> * gcc.target/i386/avx512cd-vpbroadcastmw2d-1.c: Likewise.
> * gcc.target/i386/avx512dq-vfpclasspd-1.c: Likewise.
> * gcc.target/i386/avx512dq-vfpclassps-1.c: Likewise.
> * gcc.target/i386/avx512dq-vinsertf64x2-1.c: Likewise.
> * gcc.target/i386/avx512dq-vinserti64x2-1.c: Likewise.
> * gcc.target/i386/avx512f-gather-5.c: Likewise.
> * gcc.target/i386/avx512f-vptestmd-1.c: Likewise.
> * gcc.target/i386/avx512f-vptestmq-1.c: Likewise.
> * gcc.target/i386/avx512f-vptestnmd-1.c: Likewise.
> * gcc.target/i386/avx512f-vptestnmq-1.c: Likewise.
> * gcc.target/i386/avx512f-vrndscaleps-1.c: Likewise.
> * gcc.target/i386/avx512vl-vpbroadcastmb2q-1.c: Likewise.
> * gcc.target/i386/avx512vl-vpbroadcastmw2d-1.c: Likewise.
> * gcc.target/i386/avx512vl-vptestmd-1.c: Likewise.
> * gcc.target/i386/avx512vl-vptestmq-1.c: Likewise.
> * gcc.target/i386/avx512vl-vptestnmd-1.c: Likewise.
> * gcc.target/i386/avx512vl-vptestnmq-1.c: Likewise.
> * gcc.target/i386/pr32219-2.c: Allow registers other than %eax in
> scans.
> * gcc.target/i386/pr32219-4.c: Likewise.
> * gcc.target/i386/pr32219-6.c: Likewise.
> * gcc.target/i386/pr32219-8.c: Likewise.

OK.

Thanks,
Uros.