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/testData/multiplatform/incompatibleFunctions/jvm.kt

@@ -0,0 +1,14 @@
+impl fun Int.plus(s: CharSequence): Int = 0
+impl infix fun Int.minus(s: String): Int = 1
+
+impl fun Double.times(x: CharArray) {}
+impl operator fun Double.divide(x: ByteArray) {}
+
+impl fun f1() {}
+impl external fun g1()
+
+impl fun f2() {}
+impl inline fun g2() {}
+
+impl fun f3() {}
+impl tailrec fun g3() {}