Support for macos_arm64 target in backend

(cherry picked from commit 82775e93c1389f21f9be97bd0edfd16dd50300ea)

kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/BitcodeCompiler.kt

@@ -52,13 +52,19 @@ internal class BitcodeCompiler(val context: Context) {
 
         val profilingFlags = llvmProfilingFlags().map { listOf("-mllvm", it) }.flatten()
 
-        // LLVM we use does not have support for arm64_32.
         // TODO: fix with LLVM update.
         val targetTriple = when (context.config.target) {
+            // LLVM we use does not have support for arm64_32.
             KonanTarget.WATCHOS_ARM64 -> {
                 require(configurables is AppleConfigurables)
                 "arm64_32-apple-watchos${configurables.osVersionMin}"
             }
+            // Runtime generates bitcode for mythical macos 10.16 because of old Clang.
+            // Let's fix it.
+            KonanTarget.MACOS_ARM64 -> {
+                require(configurables is AppleConfigurables)
+                "arm64-apple-macos${configurables.osVersionMin}"
+            }
             else -> context.llvm.targetTriple
         }
         val flags = overrideClangOptions.takeIf(List<String>::isNotEmpty)

kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/llvm/objcexport/ObjCExportCodeGenerator.kt

@@ -1671,6 +1671,7 @@ private fun Context.is64BitNSInteger(): Boolean = when (val target = this.config
     KonanTarget.TVOS_ARM64,
     KonanTarget.TVOS_X64,
     KonanTarget.MACOS_X64,
+    KonanTarget.MACOS_ARM64,
     KonanTarget.WATCHOS_X64 -> true
     KonanTarget.WATCHOS_ARM64,
     KonanTarget.WATCHOS_ARM32,
@@ -1702,6 +1703,7 @@ internal fun Context.is64BitLong(): Boolean = when (this.config.target) {
     KonanTarget.MINGW_X64,
     KonanTarget.LINUX_X64,
     KonanTarget.MACOS_X64,
+    KonanTarget.MACOS_ARM64,
     KonanTarget.WATCHOS_X64 -> true
     KonanTarget.WATCHOS_ARM64,
     KonanTarget.WATCHOS_ARM32,

kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/objcexport/ObjCExport.kt

@@ -136,8 +136,7 @@ internal class ObjCExport(val context: Context, symbolTable: SymbolTable) {
         modules.child("module.modulemap").writeBytes(moduleMap.toByteArray())
 
         emitInfoPlist(frameworkContents, frameworkName)
-
-        if (target == KonanTarget.MACOS_X64) {
+        if (target.family == Family.OSX) {
             framework.child("Versions/Current").createAsSymlink("A")
             for (child in listOf(frameworkName, "Headers", "Modules", "Resources")) {
                 framework.child(child).createAsSymlink("Versions/Current/$child")
@@ -163,7 +162,7 @@ internal class ObjCExport(val context: Context, symbolTable: SymbolTable) {
             KonanTarget.IOS_X64 -> "iPhoneSimulator"
             KonanTarget.TVOS_ARM64 -> "AppleTVOS"
             KonanTarget.TVOS_X64 -> "AppleTVSimulator"
-            KonanTarget.MACOS_X64 -> "MacOSX"
+            KonanTarget.MACOS_X64, KonanTarget.MACOS_ARM64 -> "MacOSX"
             KonanTarget.WATCHOS_ARM32, KonanTarget.WATCHOS_ARM64 -> "WatchOS"
             KonanTarget.WATCHOS_X86, KonanTarget.WATCHOS_X64 -> "WatchSimulator"
             else -> error(target)