[PATCH] An attempt at fixing lifetime extended temporaries in the CFG.

[Manuel Klimek]

Hi jordan_rose,

Fix handling of lifetime extended temporaries by using the
MaterializeTemporaryExpr as indication of whether a temporary was actually
extended. As lifetime extended temporaries do not necessarily have VarDecls,
changes the type of the destructors for those to reuse CFGTemopraryDtor.

Open problems:
- temporary dtors are not yet inlined, but some tests rely on dtor inlining
  for lifetime extended temporaries
- there are still missing cases for when we do not want to continue digging
  through the AST for the CXXBindTemporaryExpr after hitting a
  MaterializeTemporaryExpr; we now have 3 different places in the code that
  encodes this information; some refactoring is needed to clean that up
- more tests needed

This is still rough, but I wanted to get early feedback about the direction this
is taking.

http://reviews.llvm.org/D4706

Files:
  lib/Analysis/CFG.cpp
  test/Analysis/cfg.cpp
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