Remove support for legacy const, part 1

test/mjsunit/parallel-optimize-disabled.js

 // Copyright 2013 the V8 project authors. All rights reserved.
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 // modification, are permitted provided that the following conditions are
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 //
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 // Flags: --nodead-code-elimination --concurrent-recompilation
-// Flags: --allow-natives-syntax --legacy-const
+// Flags: --allow-natives-syntax
 
 if (!%IsConcurrentRecompilationSupported()) {
   print("Concurrent recompilation is disabled. Skipping this test.");
   quit();
 }
 
 function g() {  // g() cannot be optimized.
   const x = 1;
-  x++;
+  // TODO(adamk): Is this test still testing anything?
+  // x++;
 }
 
 function f(x) {
   g();
 }
 
 f();
 f();
 %OptimizeFunctionOnNextCall(f);
 %OptimizeFunctionOnNextCall(g, "concurrent");
 f(0);  // g() is disabled for optimization on inlining attempt.
 // Attempt to optimize g() should not run into any assertion.
 assertUnoptimized(g, "sync");