MIPS: [turbofan] Also optimize unsigned division by constant.

src/mips/macro-assembler-mips.cc

Index: src/mips/macro-assembler-mips.cc
diff --git a/src/mips/macro-assembler-mips.cc b/src/mips/macro-assembler-mips.cc
index 03419cad03cb38f3a80a8e19e87371528382d911..a5af1b8d65b1450d777d346c702fb44a1f2d5292 100644
--- a/src/mips/macro-assembler-mips.cc
+++ b/src/mips/macro-assembler-mips.cc
@@ -740,6 +740,28 @@ void MacroAssembler::Mult(Register rs, const Operand& rt) {
 }
 
 
+void MacroAssembler::Mulhu(Register rd, Register rs, const Operand& rt) {
+  if (rt.is_reg()) {
+    if (!IsMipsArchVariant(kMips32r6)) {
+      multu(rs, rt.rm());
+      mfhi(rd);
+    } else {
+      muhu(rd, rs, rt.rm());
+    }
+  } else {
+    // li handles the relocation.
+    DCHECK(!rs.is(at));
+    li(at, rt);
+    if (!IsMipsArchVariant(kMips32r6)) {
+      multu(rs, at);
+      mfhi(rd);
+    } else {
+      muhu(rd, rs, at);
+    }
+  }
+}
+
+
 void MacroAssembler::Multu(Register rs, const Operand& rt) {
   if (rt.is_reg()) {
     multu(rs, rt.rm());