[LazyValueInfo] Make solveBlockValueCast take a CastInst* instead of Instruction*. Makes getOpcode return the appropriate enum without a cast. NFC

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@304655 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed