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Florian Hahn
2d05f76ffa
By using a union for Constant* and ConstantRange we can shave off ptr size bytes off lattice elements. On 64 bit systems, it brings down the size to 40 bytes from 48 bytes. Initialization of Range happens on-demand using placement new, if the state changes to constantrange from non-constantrange. Similarly, the Range object is destroyed if the state changes from constantrange to non-constantrange. Reviewers: reames, anna, davide Reviewed By: reames, davide Differential Revision: https://reviews.llvm.org/D41903 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@323049 91177308-0d34-0410-b5e6-96231b3b80d8
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