target-i386: Remove unused macros

Commit 11f8cdbc removed all the uses of the X86_64_ONLY
macro. The BUGGY_64() macro has been unused for a long time:
it originally marked some ops which couldn't be enabled
because of issues with the pre-TCG code generation scheme.
Remove the now-unnecessary definitions of both macros.
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>
Reviewed-by: NStefan Weil <sw@weilnetz.de>
Signed-off-by: NBlue Swirl <blauwirbel@gmail.com>

target-i386/translate.c

@@ -38,17 +38,11 @@
 #define PREFIX_ADR    0x10
 
 #ifdef TARGET_X86_64
-#define X86_64_ONLY(x) x
 #define X86_64_DEF(...)  __VA_ARGS__
 #define CODE64(s) ((s)->code64)
 #define REX_X(s) ((s)->rex_x)
 #define REX_B(s) ((s)->rex_b)
-/* XXX: gcc generates push/pop in some opcodes, so we cannot use them */
-#if 1
-#define BUGGY_64(x) NULL
-#endif
 #else
-#define X86_64_ONLY(x) NULL
 #define X86_64_DEF(...)
 #define CODE64(s) 0
 #define REX_X(s) 0