Introduce collective --harmony flag.

test/mjsunit/harmony/block-let-declaration.js

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-// Flags: --harmony-block-scoping
+// Flags: --harmony-scoping
 
 // Test let declarations in various settings.
 
 // Global
 let x;
 let y = 2;
 
 // Block local
 {
   let y;
@@ skipping 68 matching lines @@
 
 // Test function declarations in statement position in strict mode.
 TestLocalThrows("function f() { 'use strict'; if (true) function g() {}", SyntaxError);
 TestLocalThrows("function f() { 'use strict'; if (true) {} else function g() {}", SyntaxError);
 TestLocalThrows("function f() { 'use strict'; do function g() {} while (false)", SyntaxError);
 TestLocalThrows("function f() { 'use strict'; while (false) function g() {}", SyntaxError);
 TestLocalThrows("function f() { 'use strict'; label: function g() {}", SyntaxError);
 TestLocalThrows("function f() { 'use strict'; for (;false;) function g() {}", SyntaxError);
 TestLocalThrows("function f() { 'use strict'; switch (true) { case true: function g() {} }", SyntaxError);
 TestLocalThrows("function f() { 'use strict'; switch (true) { default: function g() {} }", SyntaxError);