bytecode: enhance symbol table with both slab and symbol name

frontend/src/main/kotlin/gay/pizza/pork/frontend/SourceLocation.kt

@@ -3,7 +3,7 @@ package gay.pizza.pork.frontend
 import gay.pizza.pork.tokenizer.SourceIndex
 
 data class SourceLocation(val form: String, val filePath: String, val index: SourceIndex? = null) {
-  val commonFriendlyName: String by lazy { "$form $filePath" }
+  val commonLocationIdentity: String by lazy { "$form $filePath" }
 
   fun withSourceIndex(index: SourceIndex): SourceLocation =
     SourceLocation(form, filePath, index)