JS: Only introduce receiver edges for explicit receiver-passing

This is technically orthogonal to incremental API graphs, but factoring
it out causes too many conflicts.

Author: asgerf

javascript/ql/lib/semmle/javascript/ApiGraphs.qll

@@ -974,6 +974,11 @@ module API {
         )
       }
 
+      private DataFlow::Node getReceiverIfExplicit(DataFlow::CallNode call) {
+        result = call.getReceiver() and
+        not call instanceof DataFlow::MethodCallNode
+      }
+
       /**
        * Holds if `arg` is passed as the `i`th argument to a use of `base`, either by means of a
        * full invocation, or in a partial function application.
@@ -986,7 +991,7 @@ module API {
         |
           arg = pred.getAnInvocation().getArgument(i - bound)
           or
-          arg = pred.getACall().getReceiver() and
+          arg = getReceiverIfExplicit(pred.getACall()) and
           bound = 0 and
           i = -1
           or