This patch restores x86_64-linux-gnu bootstrap after my patch for 52372.
Applied as obvious.

Sorry for the breakage.


        PR middle-end/52515
        * rtl.h (pc_rtx, cc0_rtx, ret_rtx, simple_return_rtx): Add GTY markers.

Index: gcc/rtl.h
--- gcc/rtl.h   2012-03-07 09:49:12.000000000 +0000
+++ gcc/rtl.h   2012-03-07 09:49:12.878790539 +0000
@@ -2089,10 +2089,10 @@ #define CONST1_RTX(MODE) (const_tiny_rtx
 #define CONST2_RTX(MODE) (const_tiny_rtx[2][(int) (MODE)])
 #define CONSTM1_RTX(MODE) (const_tiny_rtx[3][(int) (MODE)])
-extern rtx pc_rtx;
-extern rtx cc0_rtx;
-extern rtx ret_rtx;
-extern rtx simple_return_rtx;
+extern GTY(()) rtx pc_rtx;
+extern GTY(()) rtx cc0_rtx;
+extern GTY(()) rtx ret_rtx;
+extern GTY(()) rtx simple_return_rtx;
 /* If HARD_FRAME_POINTER_REGNUM is defined, then a special dummy reg
    is used to represent the frame pointer.  This is because the

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