Revert "Add a key to enable spilling of all variables in a suspending context"

This reverts commit 38d97d0621.

compiler/cli/cli-common/src/org/jetbrains/kotlin/cli/common/arguments/K2JVMCompilerArguments.kt

@@ -511,13 +511,6 @@ Also sets `-jvm-target` value equal to the selected JDK version"""
     )
     var linkViaSignatures: Boolean by FreezableVar(false)
 
-    @Argument(
-        value = "-Xdebug",
-        description = "Enable debug mode for compilation.\n" +
-                "Currently this includes spilling all variables in a suspending context regardless their liveness."
-    )
-    var enableDebugMode: Boolean by FreezableVar(false)
-
     override fun configureAnalysisFlags(collector: MessageCollector, languageVersion: LanguageVersion): MutableMap<AnalysisFlag<*>, Any> {
         val result = super.configureAnalysisFlags(collector, languageVersion)
         result[JvmAnalysisFlags.strictMetadataVersionSemantics] = strictMetadataVersionSemantics

compiler/cli/src/org/jetbrains/kotlin/cli/jvm/jvmArguments.kt

@@ -310,8 +310,6 @@ fun CompilerConfiguration.configureAdvancedJvmOptions(arguments: K2JVMCompilerAr
 
     put(JVMConfigurationKeys.LINK_VIA_SIGNATURES, arguments.linkViaSignatures)
 
-    put(JVMConfigurationKeys.ENABLE_DEBUG_MODE, arguments.enableDebugMode)
-
     val assertionsMode =
         JVMAssertionsMode.fromStringOrNull(arguments.assertionsMode)
     if (assertionsMode == null) {