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brooks
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2020-02-27T20:08:46.538538Z
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Merge commit 7214f7a79 from llvm git (by Sam Elliott):

  [RISCV] Lower llvm.trap and llvm.debugtrap

  Summary:
  Until this commit, these have lowered to a call to abort().

  `llvm.trap()` now lowers to `unimp`, which should trap on all systems.

  `llvm.debugtrap()` now lowers to `ebreak`, which is exactly what this
  instruction is for.

  Reviewers: asb, luismarques

  Reviewed By: asb

  Tags: #llvm

  Differential Revision: https://reviews.llvm.org/D69390

This fixes miscompilation resulting in linking failures with
INVARIANTS disabled.

Reviewed by:	dim
Differential Revision:	https://reviews.freebsd.org/D23857

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