tcg/arm: Remove fallback definition of __ARM_ARCH

GCC since 4.8 provides the definition and we now require 7.5.

Reviewed-by: Peter Maydell <[email protected]>
Signed-off-by: Richard Henderson <[email protected]>

Author: rth7680

tcg/arm/tcg-target.h

@@ -26,25 +26,6 @@
 #ifndef ARM_TCG_TARGET_H
 #define ARM_TCG_TARGET_H
 
-/* The __ARM_ARCH define is provided by gcc 4.8.  Construct it otherwise.  */
-#ifndef __ARM_ARCH
-# if defined(__ARM_ARCH_7__) || defined(__ARM_ARCH_7A__) \
-     || defined(__ARM_ARCH_7R__) || defined(__ARM_ARCH_7M__) \
-     || defined(__ARM_ARCH_7EM__)
-#  define __ARM_ARCH 7
-# elif defined(__ARM_ARCH_6__) || defined(__ARM_ARCH_6J__) \
-       || defined(__ARM_ARCH_6Z__) || defined(__ARM_ARCH_6ZK__) \
-       || defined(__ARM_ARCH_6K__) || defined(__ARM_ARCH_6T2__)
-#  define __ARM_ARCH 6
-# elif defined(__ARM_ARCH_5__) || defined(__ARM_ARCH_5E__) \
-       || defined(__ARM_ARCH_5T__) || defined(__ARM_ARCH_5TE__) \
-       || defined(__ARM_ARCH_5TEJ__)
-#  define __ARM_ARCH 5
-# else
-#  define __ARM_ARCH 4
-# endif
-#endif
-
 extern int arm_arch;
 
 #if defined(__ARM_ARCH_5T__) \