[K/N] Introduce LLD compatibility checker for MinGW

We are going to switch to LLD linker for MinGW targets.
Right now LLD for MinGW doesn't support all features
of ld.bfd and thus this change might be breaking for some users.
To make transition smoother, we run lld -### to show a warning to user
so they can update their compilation options before LLD will be turned
on by default.

More details: https://youtrack.jetbrains.com/issue/KT-47605

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

@@ -298,6 +298,15 @@ class K2Native : CLICompiler<K2NativeCompilerArguments>() {
                     configuration.report(ERROR, "-Xgc-aggressive is only supported for -memory-model experimental")
                 }
                 put(GARBAGE_COLLECTOR_AGRESSIVE, arguments.gcAggressive)
+                put(CHECK_LLD_COMPATIBILITY, when (val it = arguments.checkLldCompatibility) {
+                    "enable" -> true
+                    "disable" -> false
+                    null -> true
+                    else -> {
+                        configuration.report(ERROR, "Unsupported '-Xcheck-compatibility-with-lld' value: $it. Possible values are 'enable'/'disable'")
+                        true
+                    }
+                })
             }
         }
     }

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

@@ -314,6 +314,13 @@ class K2NativeCompilerArguments : CommonCompilerArguments() {
     @Argument(value="-Xgc-aggressive", description = "Make GC agressive. Works only with -memory-model experimental")
     var gcAggressive: Boolean = false
 
+    @Argument(
+            value = "-Xcheck-compatibility-with-lld",
+            valueDescription = "{disable|enable}",
+            description = "Check that linker flags are compatible with LLD."
+    )
+    var checkLldCompatibility: String? = null
+
     override fun configureAnalysisFlags(collector: MessageCollector, languageVersion: LanguageVersion): MutableMap<AnalysisFlag<*>, Any> =
             super.configureAnalysisFlags(collector, languageVersion).also {
                 val useExperimental = it[AnalysisFlags.useExperimental] as List<*>