Import tests from Google V8 (iteration semantics)

computed-property-names: follow up corrections. Fixes gh-198

These tests are derived from the following files within the Google V8
project:

test/mjsunit/es6/iteration-semantics.js

computed-property-names: corrections. Fixes gh-198

Import tests from Google V8 (Block Scoping)

Import tests from Google V8 (Array isConcatSpreadable)

computed-property-names: corrections. Fixes gh-198

Symbol.species tests

Make writability helper function non-destructive

Initial tests for property existence
move getter name test to builtin-getter-name
initial cut at extends test
incorporate line notes, thanks @anba

Import tests from Google V8 (Computed Property Names)

Import tests from Google V8 (Class syntax & semantics)

Add Array Iteration Tests

These tests are derived from the following files within the Google V8
project:

    test/mjsunit/es6/array-iterator.js

These tests are derived from the following files within the Google V8 project:

        test/mjsunit/harmony/class-computed-property-names-super.js
        test/mjsunit/harmony/class-property-name-eval-arguments.js
        test/mjsunit/harmony/classes-experimental.js
        test/mjsunit/harmony/classes-lazy-parsing.js
        test/mjsunit/harmony/classes.js

These tests are derived from the following files within the Google V8
project:

        test/mjsunit/harmony/computed-property-names-classes.js
        test/mjsunit/harmony/computed-property-names-object-literals-methods.js
        test/mjsunit/harmony/computed-property-names-super.js
        test/mjsunit/harmony/computed-property-names.js

These tests are derived from the following files within the Google V8 project:

    	test/mjsunit/harmony/array-concat.js

After checking the writability of a given property, restore the property
value to its original state.

These tests are derived from the following files within the Google V8 project:

	test/mjsunit/harmony/block-conflicts.js
	test/mjsunit/harmony/block-for.js
	test/mjsunit/harmony/block-leave.js
	test/mjsunit/harmony/block-let-declaration.js
	test/mjsunit/harmony/block-let-semantics.js
	test/mjsunit/harmony/block-scoping.js

Fix "junit" output option to produce valid JUnit XML

Jenkins. Wrap XML output correctly and
post-process failure messages to avoid invalid XML characters.

add () to super call

format features correctly

First v8 tests

These tests are derived from the following files within the Google V8
project:

test/mjsunit/es6/string-html.js

initial set of generator tests

Import tests from Google V8 (Arrow Functions)

fix info, desc

remove dubious test

correct no-name test, add implicit-name test

harness: add checks of descriptor attributes

First check if descriptor is set up correctly, then actually
verify that the attribute (writability, enumerability,
configurability) is as expected.

2 new tests re: foreign thenables

These tests are derived from the following files within the Google V8
project:

	test/mjsunit/harmony/arrow-functions.js

Move test/built-ins/Promise/prototype/resolve/ to test/built-ins/Promise...