re PR bootstrap/41397 (RTL checking failure compiling libiberty)

	PR bootstrap/41397
	* dwarf2out.c (mem_loc_descriptor) <case SUBREG>: Recurse
	instead of assuming it has always a REG inside of it.

From-SVN: r151872

gcc/ChangeLog

+2009-09-19  Jakub Jelinek  <jakub@redhat.com>
+
+	PR bootstrap/41397
+	* dwarf2out.c (mem_loc_descriptor) <case SUBREG>: Recurse
+	instead of assuming it has always a REG inside of it.
+
 2009-09-18  Gerald Pfeifer  <gerald@pfeifer.com>
 
 	* config/freebsd.h: Update comment on types.

gcc/dwarf2out.c

@@ -11070,8 +11070,8 @@ mem_loc_descriptor (rtx rtl, enum machine_mode mode,
       rtl = XEXP (rtl, 0);
       if (GET_MODE_SIZE (GET_MODE (rtl)) > DWARF2_ADDR_SIZE)
 	break;
-
-      /* ... fall through ...  */
+      mem_loc_result = mem_loc_descriptor (rtl, mode, initialized);
+      break;
 
     case REG:
       /* Whenever a register number forms a part of the description of the