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[flang][fir] Add zero_bits operation.

Authored by schweitz on Feb 23 2021, 1:09 PM.

Description

[flang][fir] Add zero_bits operation.

This patch adds the new zero_bits operation and upstrams other changes
including the following:

  • update tablegen syntax to newer forms
  • update memory effects annotations
  • update documentation [NFC]
  • other NFC, such as whitespace and formatting

Differential revision: https://reviews.llvm.org/D97331

Details