remove macros for old compilers

gcc/rtl.h

@@ -97,22 +97,10 @@ typedef union rtunion_def
 
 typedef struct rtx_def
 {
-#ifdef ONLY_INT_FIELDS
-#ifdef CODE_FIELD_BUG
-  unsigned int code : 16;
-#else
-  unsigned short code;
-#endif
-#else
   /* The kind of expression this is.  */
   enum rtx_code code : 16;
-#endif
   /* The kind of value the expression has.  */
-#ifdef ONLY_INT_FIELDS
-  int mode : 8;
-#else
   enum machine_mode mode : 8;
-#endif
   /* 1 in an INSN if it can alter flow of control
      within this function.  Not yet used!  */
   unsigned int jump : 1;

gcc/tree.h

@@ -167,11 +167,7 @@ struct tree_common
 {
   union tree_node *chain;
   union tree_node *type;
-#ifdef ONLY_INT_FIELDS
-  unsigned int code : 8;
-#else
   enum tree_code code : 8;
-#endif
 
   unsigned side_effects_flag : 1;
   unsigned constant_flag : 1;
@@ -896,11 +892,7 @@ struct tree_type
   unsigned uid;
 
   unsigned char precision;
-#ifdef ONLY_INT_FIELDS
-  int mode : 8;
-#else
   enum machine_mode mode : 8;
-#endif
 
   unsigned string_flag : 1;
   unsigned no_force_blk_flag : 1;
@@ -1285,11 +1277,7 @@ struct tree_decl
   int linenum;
   unsigned int uid;
   union tree_node *size;
-#ifdef ONLY_INT_FIELDS
-  int mode : 8;
-#else
   enum machine_mode mode : 8;
-#endif
 
   unsigned external_flag : 1;
   unsigned nonlocal_flag : 1;

gcc/varasm.c

@@ -3079,13 +3079,8 @@ enum kind { RTX_DOUBLE, RTX_INT };
 
 struct rtx_const
 {
-#ifdef ONLY_INT_FIELDS
-  unsigned int kind : 16;
-  unsigned int mode : 16;
-#else
   enum kind kind : 16;
   enum machine_mode mode : 16;
-#endif
   union {
     union real_extract du;
     struct addr_const addr;