Remove obsolete -X compiler arguments for JVM backend

-Xno-exception-on-explicit-equals-for-boxed-null
-Xstrict-java-nullability-assertions
-Xuse-old-spilled-var-type-analysis
-Xpolymorphic-signature

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

@@ -142,12 +142,6 @@ abstract class CommonCompilerArguments : CommonToolArguments() {
     )
     var inlineClasses: Boolean by FreezableVar(false)
 
-    @Argument(
-        value = "-Xpolymorphic-signature",
-        description = "Enable experimental support for @PolymorphicSignature (MethodHandle/VarHandle)"
-    )
-    var polymorphicSignature: Boolean by FreezableVar(false)
-
     @Argument(
         value = "-Xlegacy-smart-cast-after-try",
         description = "Allow var smart casts despite assignment in try block"
@@ -443,10 +437,6 @@ abstract class CommonCompilerArguments : CommonToolArguments() {
                 put(LanguageFeature.InlineClasses, LanguageFeature.State.ENABLED)
             }
 
-            if (polymorphicSignature) {
-                put(LanguageFeature.PolymorphicSignature, LanguageFeature.State.ENABLED)
-            }
-
             if (legacySmartCastAfterTry) {
                 put(LanguageFeature.SoundSmartCastsAfterTry, LanguageFeature.State.DISABLED)
             }

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

@@ -166,9 +166,6 @@ class K2JVMCompilerArguments : CommonCompilerArguments() {
     )
     var noParamAssertions: Boolean by FreezableVar(false)
 
-    @Argument(value = "-Xstrict-java-nullability-assertions", description = "Generate nullability assertions for non-null Java expressions")
-    var strictJavaNullabilityAssertions: Boolean by FreezableVar(false)
-
     @Argument(value = "-Xno-optimize", description = "Disable optimizations")
     var noOptimize: Boolean by FreezableVar(false)
 
@@ -311,12 +308,6 @@ class K2JVMCompilerArguments : CommonCompilerArguments() {
     )
     var jspecifyAnnotations: String? by FreezableVar(null)
 
-    @Argument(
-        value = "-Xno-exception-on-explicit-equals-for-boxed-null",
-        description = "Do not throw NPE on explicit 'equals' call for null receiver of platform boxed primitive type"
-    )
-    var noExceptionOnExplicitEqualsForBoxedNull by FreezableVar(false)
-
     @Argument(
         value = "-Xjvm-default",
         valueDescription = "{all|all-compatibility|disable|enable|compatibility}",
@@ -468,12 +459,6 @@ default: `indy-with-constants` for JVM target 9 or greater, `inline` otherwise""
     )
     var repeatCompileModules: String? by NullableStringFreezableVar(null)
 
-    @Argument(
-        value = "-Xuse-old-spilled-var-type-analysis",
-        description = "Use old, SourceInterpreter-based analysis for fields, used for spilled variables in coroutines"
-    )
-    var useOldSpilledVarTypeAnalysis: Boolean by FreezableVar(false)
-
     @Argument(
         value = "-Xuse-14-inline-classes-mangling-scheme",
         description = "Use 1.4 inline classes mangling scheme instead of 1.4.30 one"
@@ -544,9 +529,6 @@ default: `indy-with-constants` for JVM target 9 or greater, `inline` otherwise""
 
     override fun configureLanguageFeatures(collector: MessageCollector): MutableMap<LanguageFeature, LanguageFeature.State> {
         val result = super.configureLanguageFeatures(collector)
-        if (strictJavaNullabilityAssertions) {
-            result[LanguageFeature.StrictJavaNullabilityAssertions] = LanguageFeature.State.ENABLED
-        }
         if (typeEnhancementImprovementsInStrictMode) {
             result[LanguageFeature.TypeEnhancementImprovementsInStrictMode] = LanguageFeature.State.ENABLED
         }