[PATCH] CodeGen: Properly null-check typeid expressions

[David Majnemer]

Hi rsmith,

Thoroughly check for a pointer dereference which yields a glvalue.  Look
through casts, comma operators, conditional operators, paren
expressions, etc.

This was originally D4416.

http://reviews.llvm.org/D4592

Files:
  lib/CodeGen/CGExprCXX.cpp
  test/CodeGenCXX/typeid-should-throw.cpp
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