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Matt Arsenault ae11fea1a6 GlobalISel: Add target pre-isel instructions
Allows targets to introduce regbankselectable
pseudo-instructions. Currently the closet feature to this is an
intrinsic. However this requires creating a public intrinsic
declaration. This litters the public intrinsic namespace with
operations we don't necessarily want to expose to IR producers, and
would rather leave as private to the backend.

Use a new instruction bit. A previous attempt tried to keep using enum
value ranges, but it turned into a mess.

llvm-svn: 373937
2019-10-07 18:43:29 +00:00
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