target/arm: Move feature test functions to their own header

The feature test functions isar_feature_*() now take up nearly
a thousand lines in target/arm/cpu.h. This header file is included
by a lot of source files, most of which don't need these functions.
Move the feature test functions to their own header file.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20231024163510.2972081-2-peter.maydell@linaro.org

linux-user/aarch64/cpu_loop.c

@@ -25,6 +25,7 @@
 #include "qemu/guest-random.h"
 #include "semihosting/common-semi.h"
 #include "target/arm/syndrome.h"
+#include "target/arm/cpu-features.h"
 
 #define get_user_code_u32(x, gaddr, env)                \
     ({ abi_long __r = get_user_u32((x), (gaddr));       \

linux-user/aarch64/signal.c

@@ -21,6 +21,7 @@
 #include "user-internals.h"
 #include "signal-common.h"
 #include "linux-user/trace.h"
+#include "target/arm/cpu-features.h"
 
 struct target_sigcontext {
     uint64_t fault_address;

linux-user/aarch64/target_prctl.h

@@ -6,6 +6,8 @@
 #ifndef AARCH64_TARGET_PRCTL_H
 #define AARCH64_TARGET_PRCTL_H
 
+#include "target/arm/cpu-features.h"
+
 static abi_long do_prctl_sve_get_vl(CPUArchState *env)
 {
     ARMCPU *cpu = env_archcpu(env);

linux-user/arm/signal.c

@@ -21,6 +21,7 @@
 #include "user-internals.h"
 #include "signal-common.h"
 #include "linux-user/trace.h"
+#include "target/arm/cpu-features.h"
 
 struct target_sigcontext {
     abi_ulong trap_no;

linux-user/elfload.c

@@ -23,6 +23,10 @@
 #include "target_signal.h"
 #include "accel/tcg/debuginfo.h"
 
+#ifdef TARGET_ARM
+#include "target/arm/cpu-features.h"
+#endif
+
 #ifdef _ARCH_PPC64
 #undef ARCH_DLINFO
 #undef ELF_PLATFORM

linux-user/mmap.c

@@ -26,6 +26,10 @@
 #include "target_mman.h"
 #include "qemu/interval-tree.h"
 
+#ifdef TARGET_ARM
+#include "target/arm/cpu-features.h"
+#endif
+
 static pthread_mutex_t mmap_mutex = PTHREAD_MUTEX_INITIALIZER;
 static __thread int mmap_lock_count;