[PATCH] D60561: [clang] fixing diagnostics of constexpr callstack

[Gauthier via Phabricator via cfe-commits]

Tyker created this revision.
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this is a bugfix for this <https://bugs.llvm.org/show_bug.cgi?id=41100>

added a constant copy of argument to CallStackFrame.
and use it in describeCall instead of the modifiable version od arguments.
added test for the diagnostic


Repository:
  rC Clang

https://reviews.llvm.org/D60561

Files:
  clang/lib/AST/ExprConstant.cpp
  clang/test/SemaCXX/constant-expression-cxx1y.cpp

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