[PATCH] Sema: avoid reuse of Exprs when synthesizing operator=

[Pavel Labath]

Hi doug.gregor,

Previously, Sema was reusing parts of the AST when synthesizing an assignment
operator, turning it into a AS-dag. This caused problems for the static
analyzer, which assumed an expression appears in the tree only once.

Here I make sure to always create a fresh Expr, when inserting something into
the AST, fixing PR16745 in the process.

http://llvm-reviews.chandlerc.com/D1425

Files:
  lib/Sema/SemaDeclCXX.cpp
  test/Analysis/operator-calls.cpp
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