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/testData/cli/js/jsExtraHelp.out

@@ -77,7 +77,6 @@ where advanced options include:
   -Xphases-to-validate-after Validate backend state after these phases
   -Xphases-to-validate-before Validate backend state before these phases
   -Xplugin=<path>            Load plugins from the given classpath
-  -Xpolymorphic-signature    Enable experimental support for @PolymorphicSignature (MethodHandle/VarHandle)
   -Xprofile-phases           Profile backend phases
   -Xproper-ieee754-comparisons Generate proper IEEE 754 comparisons in all cases if values are statically known to be of primitive numeric types
   -Xread-deserialized-contracts Enable reading of contracts from metadata

compiler/testData/cli/jvm/extraHelp.out

@@ -75,8 +75,6 @@ where advanced options include:
                                                                  Lambda objects created using `LambdaMetafactory.metafactory` will have different `toString()`.
                              -Xlambdas=class                     Generate lambdas as explicit classes
   -Xno-call-assertions       Don't generate not-null assertions for arguments of platform types
-  -Xno-exception-on-explicit-equals-for-boxed-null
-                             Do not throw NPE on explicit 'equals' call for null receiver of platform boxed primitive type
   -Xno-kotlin-nothing-value-exception
                              Do not use KotlinNothingValueException available since 1.4
   -Xno-optimize              Disable optimizations
@@ -112,8 +110,6 @@ where advanced options include:
   -Xserialize-ir             Save IR to metadata (EXPERIMENTAL)
   -Xsingle-module            Combine modules for source files and binary dependencies into a single module
   -Xskip-runtime-version-check Allow Kotlin runtime libraries of incompatible versions in the classpath
-  -Xstrict-java-nullability-assertions
-                             Generate nullability assertions for non-null Java expressions
   -Xgenerate-strict-metadata-version
                              Generate metadata with strict version semantics (see kdoc on Metadata.extraInt)
   -Xstring-concat={indy-with-constants|indy|inline}
@@ -139,8 +135,6 @@ where advanced options include:
                              Should be used in case of problems with the new implementation
   -Xuse-14-inline-classes-mangling-scheme
                              Use 1.4 inline classes mangling scheme instead of 1.4.30 one
-  -Xuse-old-spilled-var-type-analysis
-                             Use old, SourceInterpreter-based analysis for fields, used for spilled variables in coroutines
   -Xuse-type-table           Use type table in metadata serialization
   -Xvalidate-bytecode        Validate generated JVM bytecode before and after optimizations
   -Xvalidate-ir              Validate IR before and after lowering
@@ -185,7 +179,6 @@ where advanced options include:
   -Xphases-to-validate-after Validate backend state after these phases
   -Xphases-to-validate-before Validate backend state before these phases
   -Xplugin=<path>            Load plugins from the given classpath
-  -Xpolymorphic-signature    Enable experimental support for @PolymorphicSignature (MethodHandle/VarHandle)
   -Xprofile-phases           Profile backend phases
   -Xproper-ieee754-comparisons Generate proper IEEE 754 comparisons in all cases if values are statically known to be of primitive numeric types
   -Xread-deserialized-contracts Enable reading of contracts from metadata