[RISCV] Use SDT_RISCVIntUnaryOpW for RISCVISD::ABSW type profile. NFC (#168932)

This removes an unnecessary isel pattern for the RV32 HwMode.

Author: topperc

llvm/lib/Target/RISCV/RISCVInstrInfoP.td

@@ -1461,7 +1461,7 @@ let Predicates = [HasStdExtP, IsRV32] in {
 // Codegen patterns
 //===----------------------------------------------------------------------===//
 
-def riscv_absw : RVSDNode<"ABSW", SDTIntUnaryOp>;
+def riscv_absw : RVSDNode<"ABSW", SDT_RISCVIntUnaryOpW>;
 
 def SDT_RISCVPASUB : SDTypeProfile<1, 2, [SDTCisVec<0>,
                                           SDTCisInt<0>,