[ConstantRange] Optimize APInt creation in getSignedMax/getSignedMin.
We were creating an APInt at the top of these methods that isn't always returned. For ranges wider than 64-bits this results in an allocation and deallocation when its not used.
In getSignedMax we were creating Upper-1 to use in a compare and then creating it again for a return value. The compiler is unable to determine that these can be shared. So help it out and create the Upper-1 in a temporary that can be reused.
This provides a little compile time improvement.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@300621 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed