[COMMITTED] PowerPC: Add support for RFC02653 - Dense Math Facility

[Tom de Vries]

> +{"pmdmxvbf16ger2",PMMIRR|XX3(59,51),   P_GER2_MASK,	POWER10, 0,	{ACC, XA6a, XB6a, XMSK, YMSK, PMSK2}},
>  {"pmxvbf16ger2",  PMMIRR|XX3(59,51),   P_GER2_MASK,	POWER10, 0,	{ACC, XA6a, XB6a, XMSK, YMSK, PMSK2}},

Hi,

I noticed a regression in a gdb test-case:
...
FAIL: gdb.arch/powerpc-power10.exp: found: pmxvbf16ger2 a4,vs0,vs1,0,0,0
...
and I suspect it's because of this commit.


The disassembly shows:
...
    0x000000000000063c <+1596>:  pmdmxvbf16ger2 a4,vs0,vs1,0,0,0^M
...
while the test expects pmxvbf16ger2.

Thanks,
- Tom