[K/N] Introduce external calls checker compiler option

kotlin-native/backend.native/cli.bc/src/org/jetbrains/kotlin/cli/bc/K2Native.kt

@@ -189,6 +189,7 @@ class K2Native : CLICompiler<K2NativeCompilerArguments>() {
                 put(PRINT_DESCRIPTORS, arguments.printDescriptors)
                 put(PRINT_LOCATIONS, arguments.printLocations)
                 put(PRINT_BITCODE, arguments.printBitCode)
+                put(CHECK_EXTERNAL_CALLS, arguments.checkExternalCalls)
                 put(PRINT_FILES, arguments.printFiles)
 
                 put(PURGE_USER_LIBS, arguments.purgeUserLibs)

kotlin-native/backend.native/cli.bc/src/org/jetbrains/kotlin/cli/bc/K2NativeCompilerArguments.kt

@@ -195,6 +195,9 @@ class K2NativeCompilerArguments : CommonCompilerArguments() {
     @Argument(value = "-Xprint-bitcode", deprecatedName = "--print_bitcode", description = "Print llvm bitcode")
     var printBitCode: Boolean = false
 
+    @Argument(value = "-Xcheck-state-at-external-calls", description = "Check all calls of possibly long external functions are done in Native state")
+    var checkExternalCalls: Boolean = false
+
     @Argument(value = "-Xprint-descriptors", deprecatedName = "--print_descriptors", description = "Print descriptor tree")
     var printDescriptors: Boolean = false
 

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

@@ -100,6 +100,8 @@ class KonanConfigKeys {
                 = CompilerConfigurationKey.create("export KDoc into klib and framework")
         val PRINT_BITCODE: CompilerConfigurationKey<Boolean>
                 = CompilerConfigurationKey.create("print bitcode")
+        val CHECK_EXTERNAL_CALLS: CompilerConfigurationKey<Boolean>
+                = CompilerConfigurationKey.create("check external calls")
         val PRINT_DESCRIPTORS: CompilerConfigurationKey<Boolean>
                 = CompilerConfigurationKey.create("print descriptors")
         val PRINT_IR: CompilerConfigurationKey<Boolean>