Fix UB in MCJIT test cases that relied on union type punning

Reviewers: lhames, aaron.ballman

Differential Revision: http://reviews.llvm.org/D11779

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@244644 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed