[AArch64] Use MCAsmInfoMicrosoft and MCAsmInfoGNUCOFF as base classes
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Authored by mstorsjo on Jul 21 2018, 12:32 PM.

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Summary

This matches the structure used on X86 and ARM. This requires a little bit of duplication of the parts that are equal in both AArch64 COFF variants though.

Before SVN r335286, these classes didn't add anything that MCAsmInfoCOFF didn't, but now they do.

This makes AArch64 match X86 in how comdat is used for float constants for MinGW.

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rL LLVM