[kernel] Support for top-level generic functions.

runtime/vm/kernel_binary_flowgraph.h

Index: runtime/vm/kernel_binary_flowgraph.h
diff --git a/runtime/vm/kernel_binary_flowgraph.h b/runtime/vm/kernel_binary_flowgraph.h
index 1b000abaa4f16fac1ead9f0c0db18e375a377864..4ccb827263a21c3d759267e7e4875c0c7fb3d1bf 100644
--- a/runtime/vm/kernel_binary_flowgraph.h
+++ b/runtime/vm/kernel_binary_flowgraph.h
@@ -476,7 +476,8 @@ class StreamingFlowGraphBuilder {
   Fragment StaticCall(TokenPosition position,
                       const Function& target,
                       intptr_t argument_count,
-                      const Array& argument_names);
+                      const Array& argument_names,
+                      intptr_t type_args_count = 0);

[regis, 2017/08/10 23:16:56]

Please call this 'type_args_len' to be consistent with the VM code. A 'count'
could only be 0 (no type argument vector passed) or 1 (a vector is passed). We
actually provide a bit more information by passing the length of the type
argument vector, 0 meaning none is passed.

[sjindel, 2017/08/11 09:21:06]

Done.

   Fragment InstanceCall(TokenPosition position,
                         const dart::String& name,
                         Token::Kind kind,