Drop KFunction.isTailrec

The fate of this modifier seems unclear, and there doesn't seem to be any
valuable use cases for it in reflection

core/reflection.jvm/src/kotlin/reflect/jvm/internal/KFunctionImpl.kt

@@ -135,9 +135,6 @@ internal class KFunctionImpl private constructor(
     override val isInfix: Boolean
         get() = descriptor.isInfix
 
-    override val isTailrec: Boolean
-        get() = descriptor.isTailrec
-
     override val isSuspend: Boolean
         get() = descriptor.isSuspend
 

core/reflection.jvm/src/kotlin/reflect/jvm/internal/KPropertyImpl.kt

@@ -118,7 +118,6 @@ internal abstract class KPropertyImpl<out R> private constructor(
         override val isExternal: Boolean get() = descriptor.isExternal
         override val isOperator: Boolean get() = descriptor.isOperator
         override val isInfix: Boolean get() = descriptor.isInfix
-        override val isTailrec: Boolean get() = descriptor.isTailrec
         override val isSuspend: Boolean get() = descriptor.isSuspend
     }