Replace deprecated join with joinToString

core/descriptor.loader.java/src/org/jetbrains/kotlin/load/java/lazy/types/RawType.kt

@@ -58,7 +58,7 @@ public object RawTypeCapabilities : TypeCapabilities {
 
             if (!upperArgs.isNotEmpty()) return null
 
-            val newArgs = lowerArgs.map { "(raw) $it" }.join(", ")
+            val newArgs = lowerArgs.map { "(raw) $it" }.joinToString(", ")
             val newUpper =
                     if (lowerArgs.zip(upperArgs).all { onlyOutDiffers(it.first, it.second) })
                         upperRendered.replaceArgs(newArgs)

core/util.runtime/src/org/jetbrains/kotlin/utils/strings.kt

@@ -17,4 +17,4 @@
 package org.jetbrains.kotlin.utils
 
 // Needed for Java interop: otherwise you need to specify all the optional parameters to join, i.e. prefix, postfix, limit, truncated
-fun Iterable<Any>.join(separator: String) = joinToString(separator)
+fun join(collection: Iterable<Any>, separator: String) = collection.joinToString(separator)