gas standardise md_section_align

The point here is that when valueT is 64 bits and int is 32 bits,
1 << align doesn't work for shifts larger than the size of int.  (Not
that anyone is likely to use such large alignments in real code.)

gas/config/tc-m32c.c

@@ -380,7 +380,7 @@ valueT
 md_section_align (segT segment, valueT size)
 {
   int align = bfd_section_alignment (segment);
-  return ((size + (1 << align) - 1) & -(1 << align));
+  return (size + ((valueT) 1 << align) - 1) & -((valueT) 1 << align);
 }
 
 symbolS *