[TableGen][GlobalISel] Add GINodeEquiv for sdivrem/udivrem (#120819)

These nodes are not currently used in DAG patterns. Their GlobalISel
equivalents are primarily useful for testing TableGen backend, as they
produce two results. (There doesn't seem to be other such nodes.)

Author: s-barannikov

llvm/include/llvm/Target/GlobalISel/SelectionDAGCompat.td

@@ -70,6 +70,8 @@ def : GINodeEquiv<G_SDIV, sdiv>;
 def : GINodeEquiv<G_UDIV, udiv>;
 def : GINodeEquiv<G_SREM, srem>;
 def : GINodeEquiv<G_UREM, urem>;
+def : GINodeEquiv<G_SDIVREM, sdivrem>;
+def : GINodeEquiv<G_UDIVREM, udivrem>;
 def : GINodeEquiv<G_AND, and>;
 def : GINodeEquiv<G_OR, or>;
 def : GINodeEquiv<G_XOR, xor>;

llvm/include/llvm/Target/TargetSelectionDAG.td

@@ -128,8 +128,8 @@ def SDTIntShiftDOp: SDTypeProfile<1, 3, [   // fshl, fshr
 def SDTIntSatNoShOp : SDTypeProfile<1, 2, [   // ssat with no shift
   SDTCisSameAs<0, 1>, SDTCisInt<2>
 ]>;
-def SDTIntBinHiLoOp : SDTypeProfile<2, 2, [ // mulhi, mullo, sdivrem, udivrem
-  SDTCisSameAs<0, 1>, SDTCisSameAs<0, 2>, SDTCisSameAs<0, 3>,SDTCisInt<0>
+def SDTIntBinHiLoOp : SDTypeProfile<2, 2, [ // smullohi, umullohi, sdivrem, udivrem
+  SDTCisSameAs<0, 1>, SDTCisSameAs<0, 2>, SDTCisSameAs<0, 3>, SDTCisInt<0>
 ]>;
 def SDTIntScaledBinOp : SDTypeProfile<1, 3, [  // smulfix, sdivfix, etc
   SDTCisSameAs<0, 1>, SDTCisSameAs<0, 2>, SDTCisInt<0>, SDTCisInt<3>