Richard Smith 0476d069e3 PR23833, DR2140: an lvalue-to-rvalue conversion on a glvalue of type ...

nullptr_t does not access memory.

We now reuse CK_NullToPointer to represent a conversion from a glvalue
of type nullptr_t to a prvalue of nullptr_t where necessary.

This reinstates r345562, reverted in r346065, now that CodeGen's
handling of non-odr-used variables has been fixed.

llvm-svn: 363337

2019-06-13 23:31:04 +00:00

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