Fix synthetic method generation for extension properties

If several annotated extension properties with the same name were declared in
one class, JVM issued a ClassFormatError, since we generated a synthetic method
for each of them with the same name and signature. Make the signature of this
synthetic method depend on a receiver parameter, if a property has one

compiler/testData/codegen/box/properties/twoAnnotatedExtensionPropertiesWithoutBackingFields.kt

@@ -0,0 +1,9 @@
+annotation class Anno
+
+[Anno] val Int.foo: Int
+    get() = this
+
+[Anno] val String.foo: Int
+    get() = 42
+
+fun box() = if (42.foo == 42 && "OK".foo == 42) "OK" else "Fail"