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[CFG] Provide construction contexts for return value constructors.

Authored by dergachev.a on Feb 12 2018, 2:36 PM.

Description

[CFG] Provide construction contexts for return value constructors.

When the current function returns a C++ object by value, CFG elements for
constructors that construct the return values can now be queried to discover
that they're indeed participating in construction of the respective return value
at the respective return statement.

Differential Revision: https://reviews.llvm.org/D42875

llvm-svn: 324952

Details