JSC Parser: Shrink BindingNode.

JSC Parser: Shrink BindingNode.
<https://webkit.org/b/127253>

The "divot" and "end" source locations are always identical for
BindingNodes, so store only "start" and "end" instead.

1.19 MB progression on Membuster3.

Reviewed by Geoff Garen.

* bytecompiler/NodesCodegen.cpp:
(JSC::BindingNode::bindValue):
* parser/ASTBuilder.h:
(JSC::ASTBuilder::createBindingLocation):
* parser/NodeConstructors.h:
(JSC::BindingNode::create):
(JSC::BindingNode::BindingNode):
* parser/Nodes.h:
(JSC::BindingNode::divotStart):
(JSC::BindingNode::divotEnd):
* parser/Parser.cpp:
(JSC::Parser<LexerType>::createBindingPattern):
* parser/SyntaxChecker.h:
(JSC::SyntaxChecker::operatorStackPop):

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@162393 268f45cc-cd09-0410-ab3c-d52691b4dbfc