JSTests:

JSTests:
Support the 'with' keyword in FTL.
https://bugs.webkit.org/show_bug.cgi?id=175585

Patch by Robin Morisset <rmorisset@apple.com> on 2017-08-15
Reviewed by Saam Barati.

Also improve the JSTest/stress/with.js file to test
what happens when non-objects are passed to with.

* stress/with.js:
(foo):
(i.catch):
(i.with): Deleted.

Source/JavaScriptCore:
Support the 'with' keyword in FTL
https://bugs.webkit.org/show_bug.cgi?id=175585

Patch by Robin Morisset <rmorisset@apple.com> on 2017-08-15
Reviewed by Saam Barati.

Also makes sure that the order of arguments of PushWithScope, op_push_with_scope, JSWithScope::create()
and so on is consistent (always parentScope first, the new scopeObject second). We used to go from one
to the other at different step which was quite confusing. I picked this order for consistency with CreateActivation
that takes its parentScope argument first.

* bytecompiler/BytecodeGenerator.cpp:
(JSC::BytecodeGenerator::emitPushWithScope):
* debugger/DebuggerCallFrame.cpp:
(JSC::DebuggerCallFrame::evaluateWithScopeExtension):
* dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::parseBlock):
* dfg/DFGFixupPhase.cpp:
(JSC::DFG::FixupPhase::fixupNode):
* dfg/DFGSpeculativeJIT.cpp:
(JSC::DFG::SpeculativeJIT::compilePushWithScope):
* ftl/FTLCapabilities.cpp:
(JSC::FTL::canCompile):
* ftl/FTLLowerDFGToB3.cpp:
(JSC::FTL::DFG::LowerDFGToB3::compileNode):
(JSC::FTL::DFG::LowerDFGToB3::compilePushWithScope):
* jit/JITOperations.cpp:
* runtime/CommonSlowPaths.cpp:
(JSC::SLOW_PATH_DECL):
* runtime/Completion.cpp:
(JSC::evaluateWithScopeExtension):
* runtime/JSWithScope.cpp:
(JSC::JSWithScope::create):
* runtime/JSWithScope.h:

Source/WebCore:
Change the order of arguments of JSWithScope::create() for consistency
https://bugs.webkit.org/show_bug.cgi?id=175585

Patch by Robin Morisset <rmorisset@apple.com> on 2017-08-15
Reviewed by Saam Barati.

No change of behavior.

* bindings/js/JSHTMLElementCustom.cpp:
(WebCore::JSHTMLElement::pushEventHandlerScope const):

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@220778 268f45cc-cd09-0410-ab3c-d52691b4dbfc