[RISCV] Remove unused SDTypeProfile. NFC (#159156)

Author: topperc

llvm/lib/Target/RISCV/RISCVInstrInfo.td

@@ -44,9 +44,6 @@ def SDT_RISCVIntUnaryOpW : SDTypeProfile<1, 1, [
 def SDT_RISCVIntBinOpW : SDTypeProfile<1, 2, [
   SDTCisSameAs<0, 1>, SDTCisSameAs<0, 2>, SDTCisVT<0, i64>
 ]>;
-def SDT_RISCVIntShiftDOpW : SDTypeProfile<1, 3, [
-  SDTCisSameAs<0, 1>, SDTCisSameAs<0, 2>, SDTCisVT<0, i64>, SDTCisVT<3, i64>
-]>;
 
 // Target-independent nodes, but with target-specific formats.
 def callseq_start : SDNode<"ISD::CALLSEQ_START", SDT_CallSeqStart,