Support overload ambiguity resolution for callable references by expected type.

Resolve callable references taking into account expected callable types.

This affects call resolution procedure (resolve 'foo' in for 'foo(::bar)') similar to the approach used for function literals:

* During "shape arguments" phase of call resolution, callable references are resolved in independent context without expected type. If the callable reference is ambiguous, its shape type is a function placeholder type without parameter types and return type information. Otherwise, it is a reflection type for the resolved function or property. Upper-level call is resolved without taking into account ambiguous callable references.

* During "complete call" phase of call resolution, resolve callable reference arguments to actual descriptors (if possible), and update constraint system for the given call accordingly.

 #KT-6982 Fixed
 #KT-5780 Fixed

.idea/compiler.xml

@@ -4,7 +4,9 @@
     <option name="DEFAULT_COMPILER" value="Javac" />
     <option name="BUILD_PROCESS_HEAP_SIZE" value="2000" />
     <excludeFromCompile>
+      <directory url="file://$PROJECT_DIR$/core/reflection" includeSubdirectories="true" />
       <directory url="file://$PROJECT_DIR$/core/reflection.jvm" includeSubdirectories="true" />
+      <directory url="file://$PROJECT_DIR$/core/reflection.stub.jvm" includeSubdirectories="true" />
     </excludeFromCompile>
     <resourceExtensions />
     <wildcardResourcePatterns>