* i386-tdep.h (I386_MAX_REGISTER_SIZE): New define.

* i386-tdep.c (i386_do_pop_frame): Use I386_MAX_REGISTER_SIZE
instead of MAX_REGISTER_RAW_SIZE.
(i386_extract_return_value, i386_extract_struct_value_address):
Convert to use regcache.
(i386_gdbarch_init): Set max_register_raw_size and
max_register_virtual_size to I386_MAX_REGISTER_SIZE.
Set extract_return_value and extract_struct_value_address instead
of their deprecated variants.

gdb/i386-tdep.h

@@ -157,6 +157,9 @@ struct gdbarch_tdep
 #define I386_SSE_SIZEOF_REGS	(I386_SIZEOF_GREGS + I386_SIZEOF_FREGS \
 				 + I386_SIZEOF_XREGS)
 
+/* Size of the largest register.  */
+#define I386_MAX_REGISTER_SIZE	16
+
 /* Return the name of register REG.  */
 extern char const *i386_register_name (int reg);