CLI: remove obsolete -Xallow-result-return-type

compiler/testData/cli/js/jsExtraHelp.out

@@ -68,7 +68,6 @@ where advanced options include:
   -Xallow-any-scripts-in-source-roots
                              Allow compiling scripts along with regular Kotlin sources.
   -Xallow-kotlin-package     Allow compiling code in the 'kotlin' package, and allow not requiring 'kotlin.stdlib' in 'module-info'.
-  -Xallow-result-return-type Allow compiling code when 'kotlin.Result' is used as a return type.
   -Xbuiltins-from-sources    Compile built-ins from sources.
   -Xcheck-phase-conditions   Check pre- and postconditions of IR lowering phases.
   -Xcheck-sticky-phase-conditions

compiler/testData/cli/jvm/extraHelp.out

@@ -155,7 +155,6 @@ where advanced options include:
   -Xallow-any-scripts-in-source-roots
                              Allow compiling scripts along with regular Kotlin sources.
   -Xallow-kotlin-package     Allow compiling code in the 'kotlin' package, and allow not requiring 'kotlin.stdlib' in 'module-info'.
-  -Xallow-result-return-type Allow compiling code when 'kotlin.Result' is used as a return type.
   -Xbuiltins-from-sources    Compile built-ins from sources.
   -Xcheck-phase-conditions   Check pre- and postconditions of IR lowering phases.
   -Xcheck-sticky-phase-conditions

compiler/testData/cli/jvm/flagAllowingResultAsReturnType.args

@@ -1,4 +0,0 @@
-$TESTDATA_DIR$/flagAllowingResultAsReturnType.kt
--Xallow-result-return-type
--d
-$TEMP_DIR$

compiler/testData/cli/jvm/flagAllowingResultAsReturnType.kt

@@ -1 +0,0 @@
-fun foo(): Result<Int> = TODO()

compiler/testData/cli/jvm/flagAllowingResultAsReturnType.out

@@ -1 +0,0 @@
-OK