Move pthread_jit_write_protect support to build_config.h

This cannot be defined in v8config.h because target architecture
detection is not done in that file.
This CL moves the logic to set V8_HAS_PTHREAD_JIT_WRITE_PROTECT to
src/base/build_config.h, which also defines the V8_TARGET_ARCH* macros.

R=jkummerow@chromium.org, mlippautz@chromium.org

Bug: chromium:1238029
Change-Id: I2a688dad32b83df1d26bf23b15bf4485d78c8cc6
Cq-Include-Trybots: luci.v8.try:v8_mac_arm64_rel_ng
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3085271
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/master@{#76198}

include/v8config.h

@@ -553,13 +553,6 @@ V8 shared library set USING_V8_SHARED.
 
 #endif  // V8_OS_WIN
 
-// pthread_jit_write_protect is only available on arm64 Mac.
-#if defined(V8_OS_MACOSX) && !defined(V8_OS_IOS) && defined(V8_HOST_ARCH_ARM64)
-# define V8_HAS_PTHREAD_JIT_WRITE_PROTECT 1
-#else
-# define V8_HAS_PTHREAD_JIT_WRITE_PROTECT 0
-#endif
-
 // clang-format on
 
 #undef V8_HAS_CPP_ATTRIBUTE

src/base/build_config.h

@@ -211,6 +211,13 @@
 #error Unknown target architecture endianness
 #endif
 
+// pthread_jit_write_protect is only available on arm64 Mac.
+#if defined(V8_OS_MACOSX) && !defined(V8_OS_IOS) && defined(V8_HOST_ARCH_ARM64)
+#define V8_HAS_PTHREAD_JIT_WRITE_PROTECT 1
+#else
+#define V8_HAS_PTHREAD_JIT_WRITE_PROTECT 0
+#endif
+
 #if defined(V8_TARGET_ARCH_IA32) || defined(V8_TARGET_ARCH_X64)
 #define V8_TARGET_ARCH_STORES_RETURN_ADDRESS_ON_STACK true
 #else