compiler: make sure type descriptor initializers go in .rodata

    
    When creating type descriptor variables, the compiler (specifically
    Type::make_type_descriptor_var) invokes the immutable_struct() and
    immutable_struct_set_init() back end methods, so as to insure that
    these items go into the ".rodata" section of the generate object file.
    The expression initializers for these variables can contain nested
    subexpressions, however, and these subexpressions were not always
    being placed into .rodata. This patch changes the backend-gen code for
    slice initializers to emit implicit variables into .rodata if those
    initializers are part of a type descriptor init.
    
    Reviewed-on: https://go-review.googlesource.com/132596

From-SVN: r264181

gcc/go/gofrontend/MERGE

-da249ffd264154cc992e76ff03f91f700d3bf53e
+06e688ff6d829c8de3735e9f59b61b373afc596f
 
 The first line of this file holds the git revision number of the last
 merge done from the gofrontend repository.

gcc/go/gofrontend/expressions.cc

@@ -4453,7 +4453,8 @@ Unary_expression::do_get_backend(Translate_context* context)
 	      // initialize the value once, so we can use this directly
 	      // rather than copying it.  In that case we can't make it
 	      // read-only, because the program is permitted to change it.
-	      copy_to_heap = context->function() != NULL;
+	      copy_to_heap = (context->function() != NULL
+                              || context->is_const());
 	    }
 	  std::string asm_name(go_selectively_encode_id(var_name));
 	  Bvariable* implicit =