MIPS: harmony-scoping: make assignment to 'const' a late error.

src/mips64/full-codegen-mips64.cc

Index: src/mips64/full-codegen-mips64.cc
diff --git a/src/mips64/full-codegen-mips64.cc b/src/mips64/full-codegen-mips64.cc
index 0ac6467a35be64dfa07bd95ae276a47e819094c0..9d4ed095397ab11c211acedd5f4af8152b9bf6a7 100644
--- a/src/mips64/full-codegen-mips64.cc
+++ b/src/mips64/full-codegen-mips64.cc
@@ -2638,7 +2638,6 @@ void FullCodeGenerator::EmitVariableAssignment(Variable* var, Token::Value op) {
     // Perform the assignment.
     __ bind(&assign);
     EmitStoreToStackLocalOrContextSlot(var, location);
-
   } else if (!var->is_const_mode() || op == Token::INIT_CONST) {
     if (var->IsLookupSlot()) {
       // Assignment to var.
@@ -2663,8 +2662,9 @@ void FullCodeGenerator::EmitVariableAssignment(Variable* var, Token::Value op) {
       }
       EmitStoreToStackLocalOrContextSlot(var, location);
     }
+  } else if (IsSignallingAssignmentToConst(var, op, strict_mode())) {
+    __ CallRuntime(Runtime::kThrowConstAssignError, 0);
   }
-  // Non-initializing assignments to consts are ignored.
 }