Support for macos_arm64 target in backend

(cherry picked from commit 82775e93c1389f21f9be97bd0edfd16dd50300ea)

kotlin-native/shared/src/main/kotlin/org/jetbrains/kotlin/konan/target/Apple.kt

@@ -33,7 +33,7 @@ class AppleConfigurablesImpl(
 
     override val absoluteTargetSysRoot: String get() = when (val provider = xcodePartsProvider) {
         is XcodePartsProvider.Local -> when (target) {
-            KonanTarget.MACOS_X64 -> provider.xcode.macosxSdk
+            KonanTarget.MACOS_X64, KonanTarget.MACOS_ARM64 -> provider.xcode.macosxSdk
             KonanTarget.IOS_ARM32, KonanTarget.IOS_ARM64 -> provider.xcode.iphoneosSdk
             KonanTarget.IOS_X64 -> provider.xcode.iphonesimulatorSdk
             KonanTarget.TVOS_ARM64 -> provider.xcode.appletvosSdk

kotlin-native/shared/src/main/kotlin/org/jetbrains/kotlin/konan/target/ClangArgs.kt

@@ -95,6 +95,14 @@ class ClangArgs(private val configurables: Configurables) : Configurables by con
                 "-mmacosx-version-min=$osVersionMin"
         )
 
+        // Here we workaround Clang 8 limitation: macOS major version should be 10.
+        // So we compile runtime with version 10.16 and then override version in BitcodeCompiler.
+        // TODO: Fix with LLVM Update.
+        KonanTarget.MACOS_ARM64 -> listOf(
+                "-arch", "arm64",
+                "-mmacosx-version-min=10.16"
+        )
+
         KonanTarget.IOS_ARM32 -> listOf(
                 "-stdlib=libc++",
                 "-arch", "armv7",

kotlin-native/shared/src/main/kotlin/org/jetbrains/kotlin/konan/target/ConfigurablesImpl.kt

@@ -42,7 +42,7 @@ fun loadConfigurables(target: KonanTarget, properties: Properties, baseDir: Stri
         KonanTarget.LINUX_MIPS32, KonanTarget.LINUX_MIPSEL32 ->
             GccConfigurablesImpl(target, properties, baseDir)
 
-        KonanTarget.MACOS_X64,
+        KonanTarget.MACOS_X64, KonanTarget.MACOS_ARM64,
         KonanTarget.IOS_ARM32, KonanTarget.IOS_ARM64, KonanTarget.IOS_X64,
         KonanTarget.TVOS_ARM64, KonanTarget.TVOS_X64,
         KonanTarget.WATCHOS_ARM64, KonanTarget.WATCHOS_ARM32,