Expose a function needed by GNUstep.

encoding2.c

@@ -320,11 +320,6 @@ size_t objc_aligned_size(const char *type)
 	return size + (size % align);
 }
 
-/*
-  The size rounded up to the nearest integral of the wordsize, taken
-  to be the size of a void *.
-*/
-
 size_t objc_promoted_size(const char *type)
 {
 	size_t size = objc_sizeof_type(type);

objc/encoding.h

@@ -14,6 +14,8 @@ size_t objc_alignof_type(const char *type);
 
 size_t objc_aligned_size(const char *type);
 
+size_t objc_promoted_size(const char *type);
+
 void method_getReturnType(Method method, char *dst, size_t dst_len);
 
 const char *method_getTypeEncoding(Method method);