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

src/mips/code-stubs-mips.cc

Index: src/mips/code-stubs-mips.cc
diff --git a/src/mips/code-stubs-mips.cc b/src/mips/code-stubs-mips.cc
index cb597792a8d3557f02e5a4d889b6a790b99f5431..9c12a54a6a7bdcfe3f2659c3fdc9fb5f78d1019d 100644
--- a/src/mips/code-stubs-mips.cc
+++ b/src/mips/code-stubs-mips.cc
@@ -2326,7 +2326,7 @@ void BinaryOpStub_GenerateSmiCode(
 void BinaryOpStub::GenerateSmiStub(MacroAssembler* masm) {
   Label right_arg_changed, call_runtime;
 
-  if (op_ == Token::MOD && has_fixed_right_arg_) {
+  if (op_ == Token::MOD && encoded_right_arg_.has_value) {
     // It is guaranteed that the value will fit into a Smi, because if it
     // didn't, we wouldn't be here, see BinaryOp_Patch.
     __ Branch(&right_arg_changed,
@@ -2541,7 +2541,7 @@ void BinaryOpStub::GenerateInt32Stub(MacroAssembler* masm) {
         // to type transition.
 
       } else {
-        if (has_fixed_right_arg_) {
+        if (encoded_right_arg_.has_value) {
           __ Move(f16, fixed_right_arg_value());
           __ BranchF(&transition, NULL, ne, f14, f16);
         }