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[Sema] If CheckPlaceholderExpr rewrites the initializer of an auto

Description

[Sema] If CheckPlaceholderExpr rewrites the initializer of an auto
variable during auto type deduction, use the rewritten initializer when
performing initialization of the variable.

This silences spurious -Warc-repeated-use-of-weak warnings that are
issued when the initializer uses a weak ObjC pointer.

Differential Revision: https://reviews.llvm.org/D55662