[K/N][IR] Removed unnecessary hack

The hack has been rendered redundant due to the recent fixes in psi2ir

kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/lower/FunctionReferenceLowering.kt

@@ -32,13 +32,10 @@ import org.jetbrains.kotlin.ir.symbols.impl.IrClassSymbolImpl
 import org.jetbrains.kotlin.ir.symbols.impl.IrConstructorSymbolImpl
 import org.jetbrains.kotlin.ir.symbols.impl.IrSimpleFunctionSymbolImpl
 import org.jetbrains.kotlin.ir.types.*
-import org.jetbrains.kotlin.ir.types.impl.buildSimpleType
-import org.jetbrains.kotlin.ir.types.impl.makeTypeProjection
 import org.jetbrains.kotlin.ir.util.*
 import org.jetbrains.kotlin.ir.visitors.transformChildrenVoid
 import org.jetbrains.kotlin.name.FqName
 import org.jetbrains.kotlin.name.Name
-import org.jetbrains.kotlin.types.Variance
 
 internal class FunctionReferenceLowering(val context: Context): FileLoweringPass {
 
@@ -92,21 +89,6 @@ internal class FunctionReferenceLowering(val context: Context): FileLoweringPass
                 return result
             }
 
-            // TODO: Move to common IR utils.
-            fun IrType.eraseProjections(): IrType {
-                if (this !is IrSimpleType) return this
-                return buildSimpleType {
-                    this.classifier = this@eraseProjections.classifier
-                    this.hasQuestionMark = this@eraseProjections.hasQuestionMark
-                    this.annotations = this@eraseProjections.annotations
-                    this.arguments = this@eraseProjections.arguments.map {
-                        if (it !is IrTypeProjection)
-                            it
-                        else makeTypeProjection(it.type.eraseProjections(), Variance.INVARIANT)
-                    }
-                }
-            }
-
             // Handle SAM conversions which wrap a function reference:
             //     class sam$n(private val receiver: R) : Interface { override fun method(...) = receiver.target(...) }
             //
@@ -129,7 +111,7 @@ internal class FunctionReferenceLowering(val context: Context): FileLoweringPass
                         return super.visitTypeOperator(expression)
                     }
                     reference.transformChildrenVoid()
-                    return transformFunctionReference(reference, expression.typeOperand.eraseProjections())
+                    return transformFunctionReference(reference, expression.typeOperand)
                 }
                 return super.visitTypeOperator(expression)
             }