dillon1000/react

[hir] Wire up object method lowering and codegen

Object methods are lowered to functions and added to ObjectExpression. The 
codegen is interesting because we shouldn't emit code that lowers the object 
method into a separate statement and then stores it into an object expression. 

An shorthand object method has different semantics than an object method using 
the function syntax, so we need to preserve the shorthand object method syntax 
in the generated code. 

To do this, we don't immediately generate an AST node for the ObjectMethod but 
instead store it in a side table during codegen. Only when emitting code for an 
ObjectExpression, we lookup this side table and emit the object method inline in 
the body.