Dead stores checker: Fix <rdar://problem/6506065> by being more selective when say that a store is dead even though the computed value is used in the enclosing expression.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@62552 91177308-0d34-0410-b5e6-96231b3b80d8
4 files changed