JVM_IR: Generate args check in existing methods for special bridge methods.

Fix the number of arguments checked (1 for getOrDefault and 2 for
remove).

compiler/testData/codegen/box/specialBuiltins/emptyMap.kt

@@ -1,7 +1,4 @@
 // IGNORE_BACKEND_FIR: JVM_IR
-// Bridges are not generated because their signatures would conflict. The logic
-// should be inserted directly into existing methods, but this is not implemented.
-// IGNORE_BACKEND: JVM_IR
 
 private object EmptyMap : Map<Any, Nothing> {
     override val size: Int get() = 0