cmd/compile: intrinsify math/big.mulWW on MIPS64(LE),RISCV64

Change-Id: Ib8b18a892b0b1a59229ebc97a38200b53e701a77
Reviewed-on: https://go-review.googlesource.com/c/go/+/402574
Reviewed-by: Keith Randall <[email protected]>
Run-TryBot: Wayne Zuo <[email protected]>
Reviewed-by: Cherry Mui <[email protected]>
TryBot-Result: Gopher Robot <[email protected]>

Author: wdvxdr1123

src/cmd/compile/internal/ssagen/ssa.go

@@ -4675,8 +4675,8 @@ func InitTables() {
 			return s.newValue2(ssa.OpMul64uhilo, types.NewTuple(types.Types[types.TUINT64], types.Types[types.TUINT64]), args[0], args[1])
 		},
 		sys.AMD64, sys.ARM64, sys.PPC64, sys.S390X, sys.MIPS64, sys.RISCV64)
-	alias("math/bits", "Mul", "math/bits", "Mul64", sys.ArchAMD64, sys.ArchARM64, sys.ArchPPC64, sys.ArchPPC64LE, sys.ArchS390X, sys.ArchMIPS64, sys.ArchMIPS64LE, sys.ArchRISCV64)
-	alias("runtime/internal/math", "Mul64", "math/bits", "Mul64", sys.ArchAMD64, sys.ArchARM64, sys.ArchPPC64, sys.ArchPPC64LE, sys.ArchS390X, sys.ArchMIPS64, sys.ArchMIPS64LE, sys.ArchRISCV64)
+	alias("math/bits", "Mul", "math/bits", "Mul64", p8...)
+	alias("runtime/internal/math", "Mul64", "math/bits", "Mul64", p8...)
 	addF("math/bits", "Add64",
 		func(s *state, n *ir.CallExpr, args []*ssa.Value) *ssa.Value {
 			return s.newValue3(ssa.OpAdd64carry, types.NewTuple(types.Types[types.TUINT64], types.Types[types.TUINT64]), args[0], args[1], args[2])
@@ -4749,11 +4749,7 @@ func InitTables() {
 	alias("sync/atomic", "AddUintptr", "runtime/internal/atomic", "Xadd64", p8...)
 
 	/******** math/big ********/
-	add("math/big", "mulWW",
-		func(s *state, n *ir.CallExpr, args []*ssa.Value) *ssa.Value {
-			return s.newValue2(ssa.OpMul64uhilo, types.NewTuple(types.Types[types.TUINT64], types.Types[types.TUINT64]), args[0], args[1])
-		},
-		sys.ArchAMD64, sys.ArchARM64, sys.ArchPPC64LE, sys.ArchPPC64, sys.ArchS390X)
+	alias("math/big", "mulWW", "math/bits", "Mul64", p8...)
 }
 
 // findIntrinsic returns a function which builds the SSA equivalent of the