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[Sema] Look through OpaqueValueExpr when checking implicit conversions

Authored by erik.pilkington on Mar 2 2020, 10:27 AM.

Description

[Sema] Look through OpaqueValueExpr when checking implicit conversions

Specifically, this fixes a false-positive in -Wobjc-signed-char-bool.
rdar://57372317

Differential revision: https://reviews.llvm.org/D75387