[flang] Merge pull request flang-compiler/f18#951 from flang-compiler/tsk-impure
authorTim Keith <tkeith@nvidia.com>
Mon, 27 Jan 2020 19:53:53 +0000 (11:53 -0800)
committerGitHub <noreply@github.com>
Mon, 27 Jan 2020 19:53:53 +0000 (11:53 -0800)
Fix bugs detecting impure calls

Original-commit: flang-compiler/f18@db5ebec5156f3f93fb99358192307298c99fc3c4
Reviewed-on: https://github.com/flang-compiler/f18/pull/951


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