Go frontend: Add another backend type conversion

[Ian Lance Taylor]

This patch to the Go frontend by Than McIntosh tweaks
Interface_field_reference_expression::do_get_backend to apply an
additional backend type conversion to the returned result.  This is
needed due to the fact that the top level type of the expression is a
function descriptor, however the value being manufactured is a pointer
to <thunk-descriptor, value> struct.  Bootstrapped and ran Go
testsuite on x86_64-pc-linux-gnu.  Committed to mainline.

Ian

Index: gcc/go/gofrontend/MERGE
===================================================================
--- gcc/go/gofrontend/MERGE     (revision 250683)
+++ gcc/go/gofrontend/MERGE     (working copy)
@@ -1,4 +1,4 @@
-2118958321532352c91fd9406f571f8729a791cd
+f7c36b27a49131f60eedde260896d310d735d408
 
 The first line of this file holds the git revision number of the last
 merge done from the gofrontend repository.
Index: gcc/go/gofrontend/expressions.cc
===================================================================
--- gcc/go/gofrontend/expressions.cc    (revision 250682)
+++ gcc/go/gofrontend/expressions.cc    (working copy)
@@ -12057,12 +12057,15 @@ Interface_field_reference_expression::do
   Bexpression* bclosure =
     Expression::make_heap_expression(expr, loc)->get_backend(context);
 
+  Gogo* gogo = context->gogo();
+  Btype* btype = this->type()->get_backend(gogo);
+  bclosure = gogo->backend()->convert_expression(btype, bclosure, loc);
+
   Expression* nil_check =
       Expression::make_binary(OPERATOR_EQEQ, this->expr_,
                               Expression::make_nil(loc), loc);
   Bexpression* bnil_check = nil_check->get_backend(context);
 
-  Gogo* gogo = context->gogo();
   Bexpression* bcrash = gogo->runtime_error(RUNTIME_ERROR_NIL_DEREFERENCE,
                                            loc)->get_backend(context);