Chris Lattner 1945d58025 reapply r121100 with a tweak to constant fold ConstExprs with TargetData ...

(if available) as we go so that we get simple constantexprs not insane ones.
This fixes the failure of clang/test/CodeGenCXX/virtual-base-ctor.cpp
that the previous iteration of this patch had.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121111 91177308-0d34-0410-b5e6-96231b3b80d8

2010-12-07 04:33:29 +00:00

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