[pull] master from apple:master#50

Merged

pull[bot] merged 2 commits intoswiftwasm:masterfrom

swiftlang:master

Feb 3, 2020

Commits on Feb 3, 2020

[semantic-arc] Attempt to handle indirect_mutating parameters that are never written to.
gottesmm
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Merge pull request #29480 from gottesmm/pr-53b63ed55998c4245196c9d026b31c41598abb2e
gottesmm
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