LibJS: Rename VM::get_reference() => resolve_binding()

This function maps to the ResolveBinding operation from the spec,
so let's rename it to match.

Userland/Libraries/LibJS/AST.cpp

@@ -669,7 +669,7 @@ Reference Expression::to_reference(Interpreter&, GlobalObject&) const
 
 Reference Identifier::to_reference(Interpreter& interpreter, GlobalObject&) const
 {
-    return interpreter.vm().get_reference(string());
+    return interpreter.vm().resolve_binding(string());
 }
 
 Reference MemberExpression::to_reference(Interpreter& interpreter, GlobalObject& global_object) const

Userland/Libraries/LibJS/Runtime/VM.cpp

@@ -392,8 +392,11 @@ Value VM::get_variable(const FlyString& name, GlobalObject& global_object)
     return value;
 }
 
-Reference VM::get_reference(const FlyString& name)
+// 9.4.2 ResolveBinding ( name [ , env ] ), https://tc39.es/ecma262/#sec-resolvebinding
+Reference VM::resolve_binding(FlyString const& name)
 {
+    // FIXME: This implementation of ResolveBinding is non-conforming.
+
     for (auto* environment_record = lexical_environment(); environment_record && environment_record->outer_environment(); environment_record = environment_record->outer_environment()) {
         auto possible_match = environment_record->get_from_environment_record(name);
         if (possible_match.has_value())

Userland/Libraries/LibJS/Runtime/VM.h

@@ -202,7 +202,7 @@ public:
     void assign(const FlyString& target, Value, GlobalObject&, bool first_assignment = false, EnvironmentRecord* specific_scope = nullptr);
     void assign(const NonnullRefPtr<BindingPattern>& target, Value, GlobalObject&, bool first_assignment = false, EnvironmentRecord* specific_scope = nullptr);
 
-    Reference get_reference(const FlyString& name);
+    Reference resolve_binding(FlyString const&);
 
     template<typename T, typename... Args>
     void throw_exception(GlobalObject& global_object, Args&&... args)