Diffusion FreeBSD src repository - subversion rS342281

Pull in r329671 from upstream clang trunk (by Akira Hatanaka):
rS342281
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Pull in r329671 from upstream clang trunk (by Akira Hatanaka):

[ExprConstant] Use an AST node and a version number as a key to
create an APValue and retrieve it from map Temporaries.

The version number is needed when a single AST node is visited
multiple times and is used to create APValues that are required to be
distinct from each other (for example, MaterializeTemporaryExprs in
default arguments and VarDecls in loops).

rdar://problem/36505742

Differential Revision: https://reviews.llvm.org/D42776

This should fix 'Assertion failed: (Result.isUninit() && "temporary
created multiple times"), function createTemporary' errors (if
assertions are enabled, otherwise the compiler internal state might go
bad), when building the graphics/rawtherapee port.

Direct commit to stable/11 and stable/12, since head already has clang
7.0.1, which includes this change.

PR: 234144