[AVX512] Add masking variant for the FMA instructions

This change further evolves the base class AVX512_masking in order to make it
suitable for the masking variants of the FMA instructions.

Besides AVX512_masking there is now a new base class that instructions
including FMAs can use: AVX512_masking_3src.  With three-source (destructive)
instructions one of the sources is already tied to the destination.  This
difference from AVX512_masking is captured by this new class.  The common bits
between _masking and _masking_3src are broken out into a new super class
called AVX512_masking_common.

As with valign, there is some corresponding restructuring of the underlying
format classes.  The idea is the same we want to derive from two classes
essentially: one providing the format bits and another format-independent
multiclass supplying the various masking and non-masking instruction variants.

Existing fma tests in avx512-fma*.ll provide coverage here for the non-masking
variants.  For masking, the next patches in the series will add intrinsics and
intrinsic tests.

For AVX512_masking_3src to work, the (ins ...) dag has to be passed *without*
the leading source operand that is tied to dst ($src1).  This is necessary to
properly construct the (ins ...) for the different variants.  For the record,
I did check that if $src is mistakenly included, you do get a fairly intuitive
error message from the tablegen backend.

Part of <rdar://problem/17688758>
[AVX512] Break out the logic to lower masking intrinsics

No functional change.  This will be used by the FMA intrinsic lowering as well
and hopefully many more.
[AVX512] Add enum for the static rounding types

No functional change.  This will be used by the new FMA intrinsic lowering
code.

We can probably add NO_EXC here as well, I am just not too familiar with this
part of AVX512 yet.  We can add that later.
[X86] Break out logic to map FMA Intrinsic number to Opcode

No functional change.  Will be used to lower AVX512 masking FMA intrinsics.
[AVX512] Switch FMA intrinsics to the masking version

This does the renaming and updates the lowering logic.

Part of <rdar://problem/17688758>
[AVX512] Add test for FMA masking instrinsics