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[X86][FMA][FMA4]: Adding full coverage of MC encoding for the FMA, FMA4 isa…

Description

[X86][FMA][FMA4]: Adding full coverage of MC encoding for the FMA, FMA4 isa sets.<NFC>

NFC.
Adding MC regressions tests to cover the FMA and FMA4 ISA sets.
This patch is part of a larger task to cover MC encoding of all X86 ISA Sets starting revision https://reviews.llvm.org/D39952

Reviewers: craig.topper, RKSimon, zvi
Differential Revision: https://reviews.llvm.org/D40880

Change-Id: Ie39c0edce69ad647076b3d4e816948b2b6e1a9e4