[all-commits] [llvm/llvm-project] 97864f: Fix some corner cases missed by D71955

[River Riddle via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 97864f4f3a12272752dd8adb0f10e675ade42205
      https://github.com/llvm/llvm-project/commit/97864f4f3a12272752dd8adb0f10e675ade42205
  Author: River Riddle <riverriddle at google.com>
  Date:   2020-01-02 (Thu, 02 Jan 2020)

  Changed paths:
    M mlir/include/mlir/IR/UseDefLists.h
    M mlir/lib/IR/Value.cpp

  Log Message:
  -----------
  Fix some corner cases missed by D71955

* replaceAllUsesWith may be supplied with a null value.
* some compilers fail to implicitly convert single result operations to
OpaqueValue, so add an explicit OpOperand::set(Value) method.