Rename and simplify 'iterationMode' option

tests/cases/conformance/es6/destructuring/destructuringArrayBindingPatternAndAssignment1ES5iterable.ts

@@ -1,4 +1,4 @@
-// @iterationMode: iterable
+// @downlevelIteration: true
 /* AssignmentPattern:
  *      ObjectAssignmentPattern
  *      ArrayAssignmentPattern

tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration1ES5iterable.ts

@@ -1,4 +1,4 @@
-// @iterationMode: iterable
+// @downlevelIteration: true
 // A parameter declaration may specify either an identifier or a binding pattern.
 // The identifiers specified in parameter declarations and binding patterns
 // in a parameter list must be unique within that parameter list.

tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration3ES5iterable.ts

@@ -1,5 +1,5 @@
 // @target: es5
-// @iterationMode: iterable
+// @downlevelIteration: true
 
 // If the parameter is a rest parameter, the parameter type is any[]
 // A type annotation for a rest parameter must denote an array type.

tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration7ES5iterable.ts

@@ -1,5 +1,5 @@
 // @target: es5
-// @iterationMode: iterable
+// @downlevelIteration: true
 
 interface ISomething {
     foo: string,

tests/cases/conformance/es6/destructuring/destructuringVariableDeclaration1ES5iterable.ts

@@ -1,4 +1,4 @@
-// @iterationMode: iterable
+// @downlevelIteration: true
 // The type T associated with a destructuring variable declaration is determined as follows:
 //      If the declaration includes a type annotation, T is that type.
 var {a1, a2}: { a1: number, a2: string } = { a1: 10, a2: "world" }

tests/cases/conformance/es6/destructuring/emptyAssignmentPatterns01_ES5iterable.ts

@@ -1,6 +1,6 @@
 // @target: es5
 // @declaration: true
-// @iterationMode: iterable
+// @downlevelIteration: true
 
 var a: any;
 

tests/cases/conformance/es6/destructuring/emptyAssignmentPatterns02_ES5iterable.ts

@@ -1,6 +1,6 @@
 // @target: es5
 // @declaration: true
-// @iterationMode: iterable
+// @downlevelIteration: true
 
 var a: any;
 let x, y, z, a1, a2, a3;

tests/cases/conformance/es6/destructuring/emptyAssignmentPatterns03_ES5iterable.ts

@@ -1,6 +1,6 @@
 // @target: es5
 // @declaration: true
-// @iterationMode: iterable
+// @downlevelIteration: true
 
 var a: any;
 

tests/cases/conformance/es6/destructuring/emptyAssignmentPatterns04_ES5iterable.ts

@@ -1,6 +1,6 @@
 // @target: es5
 // @declaration: true
-// @iterationMode: iterable
+// @downlevelIteration: true
 
 var a: any;
 let x, y, z, a1, a2, a3;

tests/cases/conformance/es6/destructuring/emptyVariableDeclarationBindingPatterns01_ES5iterable.ts

@@ -1,5 +1,5 @@
 // @target: es5
-// @iterationMode: iterable
+// @downlevelIteration: true
 
 (function () {
     var a: any;

tests/cases/conformance/es6/destructuring/emptyVariableDeclarationBindingPatterns02_ES5iterable.ts

@@ -1,6 +1,6 @@
 // @target: es5
 // @declaration: true
-// @iterationMode: iterable
+// @downlevelIteration: true
 
 (function () {
     var {};

tests/cases/conformance/es6/spread/arrayLiteralSpreadES5iterable.ts

@@ -1,4 +1,4 @@
-// @iterationMode: iterable
+// @downlevelIteration: true
 function f0() {
     var a = [1, 2, 3];
     var a1 = [...a];

tests/cases/conformance/statements/for-ofStatements/ES5For-of33.ts

@@ -1,5 +1,5 @@
 //@sourcemap: true
-//@iterationMode: iterable
+//@downlevelIteration: true
 for (var v of ['a', 'b', 'c']) {
     console.log(v);
 }

tests/cases/conformance/statements/for-ofStatements/ES5For-of34.ts

@@ -1,5 +1,5 @@
 //@sourcemap: true
-//@iterationMode: iterable
+//@downlevelIteration: true
 function foo() {
     return { x: 0 };
 }

tests/cases/conformance/statements/for-ofStatements/ES5For-of35.ts

@@ -1,5 +1,5 @@
 //@sourcemap: true
-//@iterationMode: iterable
+//@downlevelIteration: true
 for (const {x: a = 0, y: b = 1} of [2, 3]) {
     a;
     b;

tests/cases/conformance/statements/for-ofStatements/ES5For-of36.ts

@@ -1,5 +1,5 @@
 //@sourcemap: true
-//@iterationMode: iterable
+//@downlevelIteration: true
 for (let [a = 0, b = 1] of [2, 3]) {
     a;
     b;