Remove all non-function-name uses of CONST_LEGACY

src/full-codegen/mips64/full-codegen-mips64.cc

Index: src/full-codegen/mips64/full-codegen-mips64.cc
diff --git a/src/full-codegen/mips64/full-codegen-mips64.cc b/src/full-codegen/mips64/full-codegen-mips64.cc
index 7212d6f415997dbcc4b3c5ad4a7dd38717df1567..4c9f49aa8458055a10376e6b690c3c89bb04e98c 100644
--- a/src/full-codegen/mips64/full-codegen-mips64.cc
+++ b/src/full-codegen/mips64/full-codegen-mips64.cc
@@ -757,7 +757,7 @@ void FullCodeGenerator::VisitVariableDeclaration(
   VariableProxy* proxy = declaration->proxy();
   VariableMode mode = declaration->mode();
   Variable* variable = proxy->var();
-  bool hole_init = mode == LET || mode == CONST || mode == CONST_LEGACY;
+  bool hole_init = mode == LET || mode == CONST;
   switch (variable->location()) {
     case VariableLocation::GLOBAL:
     case VariableLocation::UNALLOCATED:
@@ -1279,19 +1279,13 @@ void FullCodeGenerator::EmitDynamicLookupFastCase(VariableProxy* proxy,
   } else if (var->mode() == DYNAMIC_LOCAL) {
     Variable* local = var->local_if_not_shadowed();
     __ ld(v0, ContextSlotOperandCheckExtensions(local, slow));
-    if (local->mode() == LET || local->mode() == CONST ||
-        local->mode() == CONST_LEGACY) {
+    if (local->mode() == LET || local->mode() == CONST) {
       __ LoadRoot(at, Heap::kTheHoleValueRootIndex);
       __ dsubu(at, v0, at);  // Sub as compare: at == 0 on eq.
-      if (local->mode() == CONST_LEGACY) {
-        __ LoadRoot(a0, Heap::kUndefinedValueRootIndex);
-        __ Movz(v0, a0, at);  // Conditional move: return Undefined if TheHole.
-      } else {  // LET || CONST
-        __ Branch(done, ne, at, Operand(zero_reg));
-        __ li(a0, Operand(var->name()));
-        __ push(a0);
-        __ CallRuntime(Runtime::kThrowReferenceError);
-      }
+      __ Branch(done, ne, at, Operand(zero_reg));
+      __ li(a0, Operand(var->name()));
+      __ push(a0);
+      __ CallRuntime(Runtime::kThrowReferenceError);
     }
     __ Branch(done);
   }
@@ -1349,11 +1343,6 @@ void FullCodeGenerator::EmitVariableLoad(VariableProxy* proxy,
           __ push(a0);
           __ CallRuntime(Runtime::kThrowReferenceError);
           __ bind(&done);
-        } else {
-          // Uninitialized legacy const bindings are unholed.
-          DCHECK(var->mode() == CONST_LEGACY);
-          __ LoadRoot(a0, Heap::kUndefinedValueRootIndex);
-          __ Movz(v0, a0, at);  // Conditional move: Undefined if TheHole.
         }
         context()->Plug(v0);
         break;
@@ -2241,8 +2230,7 @@ void FullCodeGenerator::EmitVariableAssignment(Variable* var, Token::Value op,
     __ bind(&uninitialized_this);
     EmitStoreToStackLocalOrContextSlot(var, location);
 
-  } else if (!var->is_const_mode() ||
-             (var->mode() == CONST && op == Token::INIT)) {
+  } else if (!var->is_const_mode() || op == Token::INIT) {
     if (var->IsLookupSlot()) {
       __ Push(var->name());
       __ Push(v0);
@@ -2263,24 +2251,6 @@ void FullCodeGenerator::EmitVariableAssignment(Variable* var, Token::Value op,
       EmitStoreToStackLocalOrContextSlot(var, location);
     }
 
-  } else if (var->mode() == CONST_LEGACY && op == Token::INIT) {
-    // Const initializers need a write barrier.
-    DCHECK(!var->IsParameter());  // No const parameters.
-    if (var->IsLookupSlot()) {
-      __ li(a0, Operand(var->name()));
-      __ Push(v0, cp, a0);  // Context and name.
-      __ CallRuntime(Runtime::kInitializeLegacyConstLookupSlot);
-    } else {
-      DCHECK(var->IsStackAllocated() || var->IsContextSlot());
-      Label skip;
-      MemOperand location = VarOperand(var, a1);
-      __ ld(a2, location);
-      __ LoadRoot(at, Heap::kTheHoleValueRootIndex);
-      __ Branch(&skip, ne, a2, Operand(at));
-      EmitStoreToStackLocalOrContextSlot(var, location);
-      __ bind(&skip);
-    }
-
   } else {
     DCHECK(var->mode() == CONST_LEGACY && op != Token::INIT);
     if (is_strict(language_mode())) {