[all-commits] [llvm/llvm-project] 437a48: [flang] Handle absent optional in LOC (#73530)

[jeanPerier via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 437a48b2d9bfc6e38a0ca43f1cee48ceaf0fe249
      https://github.com/llvm/llvm-project/commit/437a48b2d9bfc6e38a0ca43f1cee48ceaf0fe249
  Author: jeanPerier <jperier at nvidia.com>
  Date:   2023-11-29 (Wed, 29 Nov 2023)

  Changed paths:
    M flang/lib/Optimizer/Builder/IntrinsicCall.cpp
    M flang/test/Lower/Intrinsics/loc.f90

  Log Message:
  -----------
  [flang] Handle absent optional in LOC (#73530)

LOC is a GNU extension, so gfortran is the reference for it, and it
accepts absent OPTIONAL and returns zero. Support this use case in flang
too.

Update the LOC test to use HLFIR while touching it.

Fixes https://github.com/llvm/llvm-project/issues/72823.