Matthias Braun 57dd5b3dea CodeGen: Cleanup regmask construction; NFC
- Avoid duplication of regmask size calculation.
- Simplify allocateRegisterMask() call.
- Rename allocateRegisterMask() to allocateRegMask() to be consistent
  with naming in MachineOperand.

llvm-svn: 337986
2018-07-26 00:27:47 +00:00
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