MIPS: Use AST's type field and merge types for unary, binary & compare ICs.

src/mips/lithium-mips.cc

Index: src/mips/lithium-mips.cc
diff --git a/src/mips/lithium-mips.cc b/src/mips/lithium-mips.cc
index 293ecb0a9a125a50aa31e4296234b2be1ea16461..c784f91b65d0fade53745773ef8cb8e96625bdba 100644
--- a/src/mips/lithium-mips.cc
+++ b/src/mips/lithium-mips.cc
@@ -1440,6 +1440,10 @@ LInstruction* LChunkBuilder::DoMod(HMod* instr) {
               instr->CheckFlag(HValue::kBailoutOnMinusZero))
           ? AssignEnvironment(result)
           : result;
+    } else if (instr->fixed_right_arg().has_value) {
+      LModI* mod = new(zone()) LModI(UseRegisterAtStart(left),
+                                     UseRegisterAtStart(right));
+      return AssignEnvironment(DefineAsRegister(mod));
     } else {
       LModI* mod = new(zone()) LModI(UseRegister(left),
                                      UseRegister(right),