Fix typos in comments.

[r19305]

ir/be/ia32/bearch_ia32.c

@@ -816,7 +816,7 @@ static int ia32_is_spillmode_compatible(const ir_mode *mode, const ir_mode *spil
 }
 
 /**
- * Check if irn can load it's operand at position i from memory (source addressmode).
+ * Check if irn can load its operand at position i from memory (source addressmode).
  * @param self   Pointer to irn ops itself
  * @param irn    The irn to be checked
  * @param i      The operands position

ir/opt/condeval.c

@@ -271,7 +271,7 @@ static void copy_and_fix(const condeval_env_t *env, ir_node *block,
 #ifdef AVOID_PHIB
 		/* we may not copy mode_b nodes, because this could produce phi with
 		 * mode_bs which can't be handled in all backends. Instead we duplicate
-		 * the node and move it to it's users */
+		 * the node and move it to its users */
 		if (mode == mode_b) {
 			const ir_edge_t *edge, *next;
 			ir_node *pred;