Initial support of function callable references

compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/descriptors/DescriptorUtils.kt

@@ -87,6 +87,30 @@ fun ClassDescriptor.getFunction(name: String, types: List<KotlinType>): Function
             .getContributedFunctions(Name.identifier(name), NoLookupLocation.FROM_BACKEND).single().substitute(typeSubstitutor)!!
 }
 
+fun ClassDescriptor.getStaticFunction(name: String, types: List<KotlinType>): FunctionDescriptor {
+    val typeSubstitutor = TypeSubstitutor.create(
+        declaredTypeParameters
+            .withIndex()
+            .associateBy({ it.value.typeConstructor }, { TypeProjectionImpl(types[it.index]) })
+    )
+    return staticScope
+        .getContributedFunctions(Name.identifier(name), NoLookupLocation.FROM_BACKEND).single().substitute(typeSubstitutor)!!
+}
+
+fun ClassDescriptor.getProperty(name: String, types: List<KotlinType>): PropertyDescriptor {
+    val typeSubstitutor = TypeSubstitutor.create(
+        declaredTypeParameters
+            .withIndex()
+            .associateBy({ it.value.typeConstructor }, { TypeProjectionImpl(types[it.index]) })
+    )
+    return unsubstitutedMemberScope
+        .getContributedVariables(
+            Name.identifier(name),
+            NoLookupLocation.FROM_BACKEND
+        ).single().substitute(typeSubstitutor) as PropertyDescriptor
+}
+
+
 val KotlinType.isFunctionOrKFunctionType: Boolean
     get() {
         val kind = constructor.declarationDescriptor?.getFunctionalClassKind()

compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/ir/Ir.kt

@@ -175,6 +175,8 @@ abstract class Symbols<out T : CommonBackendContext>(val context: T, private val
 
     val kFunctionImpl = calc { symbolTable.referenceClass(context.reflectionTypes.kFunctionImpl) }
 
+    val functionReference = calc { symbolTable.referenceClass(context.getInternalClass("FunctionReference")) }
+
     val kProperty0Impl = calc { symbolTable.referenceClass(context.reflectionTypes.kProperty0Impl) }
     val kProperty1Impl = calc { symbolTable.referenceClass(context.reflectionTypes.kProperty1Impl) }
     val kProperty2Impl = calc { symbolTable.referenceClass(context.reflectionTypes.kProperty2Impl) }

compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/lower/LowerUtils.kt

@@ -239,7 +239,7 @@ fun IrConstructor.callsSuper(): Boolean {
     return callsSuper
 }
 
-fun ParameterDescriptor.copyAsValueParameter(newOwner: CallableDescriptor, index: Int) = when (this) {
+fun ParameterDescriptor.copyAsValueParameter(newOwner: CallableDescriptor, index: Int, name: Name = this.name) = when (this) {
     is ValueParameterDescriptor -> this.copy(newOwner, name, index)
     is ReceiverParameterDescriptor -> ValueParameterDescriptorImpl(
         containingDeclaration = newOwner,