Mark internal classes as POD-like to get better behavior out of
SmallVector and DenseMap.

This speeds up SROA by 25% on PR15412.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@177259 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed