Remove unused method

Note that `yield` was allowed since 1.7.0: KT-27750

compiler/frontend/src/org/jetbrains/kotlin/types/expressions/FunctionsTypingVisitor.kt

@@ -6,7 +6,6 @@
 package org.jetbrains.kotlin.types.expressions
 
 import com.google.common.collect.Lists
-import com.intellij.psi.PsiElement
 import org.jetbrains.kotlin.builtins.*
 import org.jetbrains.kotlin.config.LanguageFeature
 import org.jetbrains.kotlin.descriptors.CallableMemberDescriptor
@@ -18,11 +17,13 @@ import org.jetbrains.kotlin.diagnostics.Errors
 import org.jetbrains.kotlin.diagnostics.Errors.*
 import org.jetbrains.kotlin.diagnostics.PsiDiagnosticUtils
 import org.jetbrains.kotlin.psi.*
-import org.jetbrains.kotlin.psi.psiUtil.checkReservedPrefixWord
 import org.jetbrains.kotlin.psi.psiUtil.checkReservedYieldBeforeLambda
 import org.jetbrains.kotlin.psi.psiUtil.getAnnotationEntries
-import org.jetbrains.kotlin.resolve.*
+import org.jetbrains.kotlin.resolve.BindingContext
 import org.jetbrains.kotlin.resolve.BindingContext.EXPECTED_RETURN_TYPE
+import org.jetbrains.kotlin.resolve.BindingContextUtils
+import org.jetbrains.kotlin.resolve.BindingTrace
+import org.jetbrains.kotlin.resolve.FunctionDescriptorUtil
 import org.jetbrains.kotlin.resolve.calls.context.ContextDependency
 import org.jetbrains.kotlin.resolve.calls.inference.BuilderInferenceSession
 import org.jetbrains.kotlin.resolve.calls.inference.model.TypeVariableTypeConstructor
@@ -41,7 +42,6 @@ import org.jetbrains.kotlin.types.expressions.typeInfoFactory.createTypeInfo
 import org.jetbrains.kotlin.types.typeUtil.contains
 import org.jetbrains.kotlin.types.typeUtil.isUnit
 import org.jetbrains.kotlin.utils.addIfNotNull
-import java.util.*
 
 internal class FunctionsTypingVisitor(facade: ExpressionTypingInternals) : ExpressionTypingVisitor(facade) {
 
@@ -195,15 +195,6 @@ internal class FunctionsTypingVisitor(facade: ExpressionTypingInternals) : Expre
         return components.dataFlowAnalyzer.createCheckedTypeInfo(resultType, context, expression)
     }
 
-    private fun checkReservedYield(context: ExpressionTypingContext, expression: PsiElement) {
-        checkReservedPrefixWord(
-            context.trace,
-            expression,
-            "yield",
-            "yield block/lambda. Use 'yield() { ... }' or 'yield(fun...)'"
-        )
-    }
-
     private fun createFunctionLiteralDescriptor(
         expression: KtLambdaExpression,
         context: ExpressionTypingContext