Philip Reames c1beae0d42 Add test cases for PRE w/volatile loads
These tests check that the combination of 227110 (cross block query inst) and 227112 (volatile load semantics) work together properly to allow PRE in cases where a loop contains a volatile access.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@227146 91177308-0d34-0410-b5e6-96231b3b80d8
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