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[X86][X87]: Adding full coverage of MC encoding for all X87 ISA Sets.<NFC>

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[X86][X87]: Adding full coverage of MC encoding for all X87 ISA Sets.<NFC>

NFC.
Currently, not all the X86 ISA Sets are covered by the MC regressions tests for X86.
A full coverage needs to be added for each ISA set and for both 32bit and 64bit instructions + registers.
This patch includes MC assembly tests for the X87 32bit and 64bit.

Reviewers: craigt, RKSimon, zvi
Differential Revision: https://reviews.llvm.org/D39952

Change-Id: I55e1719c09a70644a6a4073c720cb5341c80fee9

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