[JS IR] Detect broken cross-module references

The patch adds an error if the module can not find the cross-module reference.

 The patch removes the DCE optimization which eliminates implement() intrinsic,
 because it leads to a broken cross-module reference and
 broken JS code with implement() call, albeit in an unreachable block.

compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/serialization/FunctionalInterfacesUtils.kt

@@ -5,8 +5,17 @@
 
 package org.jetbrains.kotlin.backend.common.serialization
 
+import org.jetbrains.kotlin.ir.util.IdSignature
 import java.util.regex.Pattern
 
 internal val functionPattern = Pattern.compile("^K?(Suspend)?Function\\d+$")
 
 internal val functionalPackages = listOf("kotlin", "kotlin.coroutines", "kotlin.reflect")
+
+fun checkIsFunctionInterface(idSig: IdSignature?): Boolean {
+    val publicSig = idSig?.asPublic()
+    return publicSig != null &&
+            publicSig.packageFqName in functionalPackages &&
+            publicSig.declarationFqName.isNotEmpty() &&
+            functionPattern.matcher(publicSig.firstNameSegment).find()
+}

compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/serialization/IrModuleDeserializer.kt

@@ -124,14 +124,6 @@ class IrModuleDeserializerWithBuiltIns(
         symbol.signature to symbol
     }.toMap()
 
-    private fun checkIsFunctionInterface(idSig: IdSignature): Boolean {
-        val publicSig = idSig.asPublic()
-        return publicSig != null &&
-                publicSig.packageFqName in functionalPackages &&
-                publicSig.declarationFqName.isNotEmpty() &&
-                functionPattern.matcher(publicSig.firstNameSegment).find()
-    }
-
     override operator fun contains(idSig: IdSignature): Boolean {
         val topLevel = idSig.topLevelSignature()
         if (topLevel in irBuiltInsMap) return true