[RISCV][NFC] Clean up RISCVDAGToDAGISel::Select
As pointed out in post-commit review of r318738, `return ReplaceNode(..)` when
both ReplaceNode and the current function return void is confusing. This patch
moves to using a more obvious early return, and moves to just using an if to
catch the one case we currently care about. A future patch that adds further
custom instruction selection can introduce a switch.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@318757 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed