d: Fix run-time SIGSEGV reading ModuleInfo.flags()

The current forced alignment is not necessary, and is problematic on
targets that have strict alignment rules.

gcc/d/ChangeLog:

2019-03-31  Iain Buclaw  <ibuclaw@gdcproject.org>

	PR d/88462
	* modules.cc (layout_moduleinfo_fields): Properly align ModuleInfo,
	instead of forcing alignment to be 1.

From-SVN: r270043

gcc/d/ChangeLog

+2019-03-31  Iain Buclaw  <ibuclaw@gdcproject.org>
+
+	PR d/88462
+	* modules.cc (layout_moduleinfo_fields): Properly align ModuleInfo,
+	instead of forcing alignment to be 1.
+
 2019-03-21  Iain Buclaw  <ibuclaw@gdcproject.org>
 
 	PR d/89017

gcc/d/modules.cc

@@ -534,7 +534,9 @@ layout_moduleinfo_fields (Module *decl, tree type)
   layout_moduleinfo_field (make_array_type (Type::tchar, namelen),
 			   type, offset);
 
-  finish_aggregate_type (offset, 1, type, NULL);
+  size_t alignsize = MAX (TYPE_ALIGN_UNIT (type),
+			  TYPE_ALIGN_UNIT (ptr_type_node));
+  finish_aggregate_type (offset, alignsize, type, NULL);
 
   return type;
 }