compiler: initialize gogo fields

    
    A couple of the data members in the Gogo class were not
    being initialized properly. This was causing "uninitialized value"
    errors during Valgrind memcheck runs. This patch insures that
    all of the fields receive an initial value.
    
    Reviewed-on: https://go-review.googlesource.com/38470

From-SVN: r246407

gcc/go/gofrontend/go.cc

@@ -34,10 +34,8 @@ go_create_gogo(const struct go_create_gogo_args* args)
 
   if (args->relative_import_path != NULL)
     ::gogo->set_relative_import_path(args->relative_import_path);
-  if (args->check_divide_by_zero)
-    ::gogo->set_check_divide_by_zero(args->check_divide_by_zero);
-  if (args->check_divide_overflow)
-    ::gogo->set_check_divide_overflow(args->check_divide_overflow);
+  ::gogo->set_check_divide_by_zero(args->check_divide_by_zero);
+  ::gogo->set_check_divide_overflow(args->check_divide_overflow);
   if (args->compiling_runtime)
     ::gogo->set_compiling_runtime(args->compiling_runtime);
   if (args->c_header != NULL)

gcc/go/gofrontend/gogo.cc

@@ -50,6 +50,11 @@ Gogo::Gogo(Backend* backend, Linemap* linemap, int, int pointer_size)
     pkgpath_from_option_(false),
     prefix_from_option_(false),
     relative_import_path_(),
+    c_header_(),
+    check_divide_by_zero_(true),
+    check_divide_overflow_(true),
+    compiling_runtime_(false),
+    debug_escape_level_(0),
     verify_types_(),
     interface_types_(),
     specific_type_functions_(),