CLI: remove obsolete language feature arguments

These arguments switch language features which cannot be disabled
anymore because they're enabled from some LV not later than 1.4, and the
minimal supported LV is currently 1.4.

compiler/cli/cli-common/gen/org/jetbrains/kotlin/cli/common/arguments/CommonCompilerArgumentsCopyGenerated.kt

@@ -26,7 +26,6 @@ fun copyCommonCompilerArguments(from: CommonCompilerArguments, to: CommonCompile
     to.dumpDirectory = from.dumpDirectory
     to.dumpOnlyFqName = from.dumpOnlyFqName
     to.dumpPerf = from.dumpPerf
-    to.effectSystem = from.effectSystem
     to.enableBuilderInference = from.enableBuilderInference
     to.enableSignatureClashChecks = from.enableSignatureClashChecks
     to.expectActualClasses = from.expectActualClasses
@@ -64,8 +63,6 @@ fun copyCommonCompilerArguments(from: CommonCompilerArguments, to: CommonCompile
     to.pluginOptions = from.pluginOptions?.copyOf()
     to.profilePhases = from.profilePhases
     to.progressiveMode = from.progressiveMode
-    to.properIeee754Comparisons = from.properIeee754Comparisons
-    to.readDeserializedContracts = from.readDeserializedContracts
     to.relativePathBases = from.relativePathBases?.copyOf()
     to.renderInternalDiagnosticNames = from.renderInternalDiagnosticNames
     to.reportOutputFiles = from.reportOutputFiles
@@ -82,7 +79,6 @@ fun copyCommonCompilerArguments(from: CommonCompilerArguments, to: CommonCompile
     to.useFirLT = from.useFirLT
     to.useIrFakeOverrideBuilder = from.useIrFakeOverrideBuilder
     to.useK2 = from.useK2
-    to.useMixedNamedArguments = from.useMixedNamedArguments
     to.verbosePhases = from.verbosePhases?.copyOf()
 
     return to

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

@@ -251,26 +251,6 @@ progressive mode enabled may cause compilation errors in progressive mode."""
             field = value
         }
 
-    @Argument(
-        value = "-Xeffect-system",
-        description = "Enable experimental language feature: effect system."
-    )
-    var effectSystem = false
-        set(value) {
-            checkFrozen()
-            field = value
-        }
-
-    @Argument(
-        value = "-Xread-deserialized-contracts",
-        description = "Enable reading contracts from metadata."
-    )
-    var readDeserializedContracts = false
-        set(value) {
-            checkFrozen()
-            field = value
-        }
-
     @IDEAPluginsCompatibilityAPI(
         IDEAPlatforms._212, // maybe 211 AS used it too
         IDEAPlatforms._213,
@@ -291,16 +271,6 @@ progressive mode enabled may cause compilation errors in progressive mode."""
             field = value
         }
 
-    @Argument(
-        value = "-Xproper-ieee754-comparisons",
-        description = "Generate proper IEEE 754 comparisons in all cases if values are statically known to be of primitive numeric types."
-    )
-    var properIeee754Comparisons = false
-        set(value) {
-            checkFrozen()
-            field = value
-        }
-
     @Argument(value = "-Xreport-perf", description = "Report detailed performance statistics.")
     var reportPerf = false
         set(value) {
@@ -542,16 +512,6 @@ They should be a subset of sources passed as free arguments."""
             field = value
         }
 
-    @Argument(
-        value = "-Xuse-mixed-named-arguments",
-        description = "Allow mixing named and unnamed arguments when the arguments appear in their default order."
-    )
-    var useMixedNamedArguments = false
-        set(value) {
-            checkFrozen()
-            field = value
-        }
-
     @Argument(
         value = "-Xmetadata-klib",
         description = "Produce a klib that only contains the metadata of declarations.",
@@ -840,23 +800,6 @@ The corresponding calls' declarations may not be marked with @BuilderInference."
                 put(LanguageFeature.SoundSmartCastsAfterTry, LanguageFeature.State.DISABLED)
             }
 
-            if (effectSystem) {
-                put(LanguageFeature.UseCallsInPlaceEffect, LanguageFeature.State.ENABLED)
-                put(LanguageFeature.UseReturnsEffect, LanguageFeature.State.ENABLED)
-            }
-
-            if (readDeserializedContracts) {
-                put(LanguageFeature.ReadDeserializedContracts, LanguageFeature.State.ENABLED)
-            }
-
-            if (properIeee754Comparisons) {
-                put(LanguageFeature.ProperIeee754Comparisons, LanguageFeature.State.ENABLED)
-            }
-
-            if (useMixedNamedArguments) {
-                put(LanguageFeature.MixedNamedArgumentsInTheirOwnPosition, LanguageFeature.State.ENABLED)
-            }
-
             if (inferenceCompatibility) {
                 put(LanguageFeature.InferenceCompatibility, LanguageFeature.State.ENABLED)
             }