backend: support function types with receiver

backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/DescriptorUtils.kt

@@ -1,6 +1,7 @@
 package org.jetbrains.kotlin.backend.konan
 
 import org.jetbrains.kotlin.backend.konan.llvm.KonanBuiltIns
+import org.jetbrains.kotlin.builtins.isFunctionType
 import org.jetbrains.kotlin.descriptors.*
 import org.jetbrains.kotlin.incremental.components.NoLookupLocation
 import org.jetbrains.kotlin.name.FqName
@@ -9,6 +10,7 @@ import org.jetbrains.kotlin.resolve.OverridingUtil
 import org.jetbrains.kotlin.resolve.descriptorUtil.*
 import org.jetbrains.kotlin.types.KotlinType
 import org.jetbrains.kotlin.types.TypeUtils
+import org.jetbrains.kotlin.util.OperatorNameConventions
 
 /**
  * List of all implemented interfaces (including those which implemented by a super class)
@@ -112,3 +114,11 @@ internal val CallableDescriptor.allValueParameters: List<ParameterDescriptor>
 
         return receivers + this.valueParameters
     }
+
+internal val FunctionDescriptor.isFunctionInvoke: Boolean
+    get() {
+        val dispatchReceiver = dispatchReceiverParameter ?: return false
+
+        return dispatchReceiver.type.isFunctionType &&
+                this.isOperator && this.name == OperatorNameConventions.INVOKE
+    }

backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/llvm/IrToBitcode.kt

@@ -4,7 +4,6 @@ import kotlinx.cinterop.*
 import llvm.*
 import org.jetbrains.kotlin.backend.konan.*
 import org.jetbrains.kotlin.builtins.KotlinBuiltIns
-import org.jetbrains.kotlin.builtins.functions.FunctionInvokeDescriptor
 import org.jetbrains.kotlin.descriptors.*
 import org.jetbrains.kotlin.incremental.components.NoLookupLocation
 import org.jetbrains.kotlin.ir.IrElement
@@ -1563,8 +1562,12 @@ internal class CodeGeneratorVisitor(val context: Context) : IrElementVisitorVoid
 
     private fun evaluateFunctionCall(tmpVariableName: String, callee: IrCall, args: List<LLVMValueRef>): LLVMValueRef {
         val descriptor:FunctionDescriptor = callee.descriptor as FunctionDescriptor
+
+        if (descriptor.isFunctionInvoke) {
+            return evaluateFunctionInvoke(tmpVariableName, descriptor, args)
+        }
+
         when (descriptor) {
-            is FunctionInvokeDescriptor        -> return evaluateFunctionInvoke    (tmpVariableName, descriptor, args)
             is IrBuiltinOperatorDescriptorBase -> return evaluateOperatorCall      (tmpVariableName, callee,     args)
             is ClassConstructorDescriptor      -> return evaluateConstructorCall   (tmpVariableName, callee,     args)
             else                               -> return evaluateSimpleFunctionCall(tmpVariableName, descriptor, args)
@@ -1582,7 +1585,7 @@ internal class CodeGeneratorVisitor(val context: Context) : IrElementVisitorVoid
     }
 
     private fun evaluateFunctionInvoke(tmpVariableName: String,
-                                       descriptor: FunctionInvokeDescriptor,
+                                       descriptor: FunctionDescriptor,
                                        args: List<LLVMValueRef>): LLVMValueRef {
 
         // Note: the whole function code below is written in the assumption that