Remove support for legacy const, part 1

test/mjsunit/regress/regress-1199637.js

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-// Flags: --allow-natives-syntax --legacy-const
+// Flags: --allow-natives-syntax
 
-// Make sure that we can introduce global variables (using
-// both var and const) that shadow even READ_ONLY variables
-// in the prototype chain.
-const NONE = 0;
-const READ_ONLY = 1;
+// Make sure that we can introduce global variables that shadow even
+// READ_ONLY variables in the prototype chain.
+var NONE = 0;
+var READ_ONLY = 1;
 
 // Use DeclareGlobal...
 %AddNamedProperty(this.__proto__, "a", 1234, NONE);
 assertEquals(1234, a);
 eval("var a = 5678;");
 assertEquals(5678, a);
 
 %AddNamedProperty(this.__proto__, "b", 1234, NONE);
 assertEquals(1234, b);
-eval("const b = 5678;");
+eval("var b = 5678;");
 assertEquals(5678, b);
 
 %AddNamedProperty(this.__proto__, "c", 1234, READ_ONLY);
 assertEquals(1234, c);
 eval("var c = 5678;");
 assertEquals(5678, c);
 
 %AddNamedProperty(this.__proto__, "d", 1234, READ_ONLY);
 assertEquals(1234, d);
-eval("const d = 5678;");
+eval("var d = 5678;");
 assertEquals(5678, d);
 
 // Use DeclareContextSlot...
 %AddNamedProperty(this.__proto__, "x", 1234, NONE);
 assertEquals(1234, x);
 eval("with({}) { var x = 5678; }");
 assertEquals(5678, x);
 
 %AddNamedProperty(this.__proto__, "y", 1234, NONE);
 assertEquals(1234, y);
-eval("with({}) { const y = 5678; }");
+eval("with({}) { var y = 5678; }");
 assertEquals(5678, y);
 
 %AddNamedProperty(this.__proto__, "z", 1234, READ_ONLY);
 assertEquals(1234, z);
 eval("with({}) { var z = 5678; }");
 assertEquals(5678, z);
 
 %AddNamedProperty(this.__proto__, "w", 1234, READ_ONLY);
 assertEquals(1234, w);
-eval("with({}) { const w = 5678; }");
+eval("with({}) { var w = 5678; }");
 assertEquals(5678, w);