Add MutableMap.remove(K, V) as built-in declaration

Use PlatformDependent annotation to guarantee it's only be available for JDK8
Also adjust type-safe bridges and mutable collection stubs generation

compiler/testData/diagnostics/testsWithJava8/targetedBuiltIns/concurrentMapRemove.kt

@@ -4,17 +4,16 @@ val concurrent: ConcurrentMap<String, Int> = null!!
 val concurrentHash: ConcurrentHashMap<String, Int> = null!!
 
 fun foo() {
-    // TODO: Too permissive
     concurrent.remove("", 1)
-    concurrent.remove("", "")
+    concurrent.remove("", <!TYPE_MISMATCH!>""<!>)
     concurrentHash.remove("", 1)
-    concurrentHash.remove("", "")
+    concurrentHash.remove("", <!TYPE_MISMATCH!>""<!>)
 
     // Flexible types
     concurrent.remove(null, 1)
     concurrent.remove(null, null)
 
     // @PurelyImplements
-    concurrentHash.remove(null, 1)
-    concurrentHash.remove(null, null)
+    concurrentHash.remove(<!NULL_FOR_NONNULL_TYPE!>null<!>, 1)
+    concurrentHash.remove(<!NULL_FOR_NONNULL_TYPE!>null<!>, <!NULL_FOR_NONNULL_TYPE!>null<!>)
 }