Chijun Sima 0566eefef9 [SimplifyCFG] Remove pointer from SmallPtrSet before deletion
Summary:
Previously, `eraseFromParent()` calls `delete` which invalidates the value of the pointer. Copying the value of the pointer later is undefined behavior in C++11 and implementation-defined (which may cause a segfault on implementations having strict pointer safety) in C++14.

This patch removes the BasicBlock pointer from related SmallPtrSet before `delete` invalidates it in the SimplifyCFG pass.

Reviewers: kuhar, dmgreen, davide, trentxintong

Reviewed By: kuhar, dmgreen

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D50717

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@339773 91177308-0d34-0410-b5e6-96231b3b80d8
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