Check platform<->impl declaration compatibility

For each platform declaration, there must be at least one impl declaration in
the module with the compatible signature; similarly, for each impl declaration,
there must be at least one platform declaration with the compatible signature.

Note that currently the presence of the 'impl' modifier is not checked yet.

Also, the sad fact is that if you have platform and impl declarations which are
not compatible, you get two errors: on the platform delcaration and on the impl
declaration. This needs to be addressed as well

compiler/frontend.java/src/org/jetbrains/kotlin/resolve/jvm/platform/JvmPlatformConfigurator.kt

@@ -21,6 +21,7 @@ import org.jetbrains.kotlin.container.useImpl
 import org.jetbrains.kotlin.container.useInstance
 import org.jetbrains.kotlin.platform.JavaToKotlinClassMap
 import org.jetbrains.kotlin.resolve.PlatformConfigurator
+import org.jetbrains.kotlin.resolve.checkers.PlatformImplDeclarationChecker
 import org.jetbrains.kotlin.resolve.jvm.JvmOverloadFilter
 import org.jetbrains.kotlin.resolve.jvm.JvmTypeSpecificityComparator
 import org.jetbrains.kotlin.resolve.jvm.RuntimeAssertionsTypeChecker
@@ -43,7 +44,8 @@ object JvmPlatformConfigurator : PlatformConfigurator(
                 TypeParameterBoundIsNotArrayChecker(),
                 JvmSyntheticApplicabilityChecker(),
                 StrictfpApplicabilityChecker(),
-                AdditionalBuiltInsMemberOverrideDeclarationChecker
+                AdditionalBuiltInsMemberOverrideDeclarationChecker,
+                PlatformImplDeclarationChecker()
         ),
 
         additionalCallCheckers = listOf(