[K/N] Add signposts to safepoints ^KT-62689

Disabled by default.

Merge-request: KT-MR-12679
Merged-by: Alexander Shabalin <Alexander.Shabalin@jetbrains.com>

native/utils/src/org/jetbrains/kotlin/konan/target/ClangArgs.kt

@@ -53,6 +53,7 @@ sealed class ClangArgs(
                     "REPORT_BACKTRACE_TO_IOS_CRASH_LOG".takeIf { target.supportsIosCrashLog() },
                     "NEED_SMALL_BINARY".takeIf { target.needSmallBinary() },
                     "SUPPORTS_GRAND_CENTRAL_DISPATCH".takeIf { target.supportsGrandCentralDispatch },
+                    "SUPPORTS_SIGNPOSTS".takeIf { target.supportsSignposts },
             ).map { "KONAN_$it=1" }
             val otherOptions = listOfNotNull(
                     "USE_ELF_SYMBOLS=1".takeIf { target.binaryFormat() == BinaryFormat.ELF },

native/utils/src/org/jetbrains/kotlin/konan/target/KonanTargetExtenstions.kt

@@ -165,7 +165,7 @@ fun KonanTarget.hasAddressDependencyInMemoryModel(): Boolean =
      }
 
 val KonanTarget.supportsGrandCentralDispatch
-    get() = when(family) {
-        Family.WATCHOS, Family.IOS, Family.TVOS, Family.OSX -> true
-        else -> false
-    }
+    get() = family.isAppleFamily
+
+val KonanTarget.supportsSignposts
+    get() = family.isAppleFamily