[JVM IR] Support target templates in

AbstractCheckLocalVariablesTableTest and fix
`checkLocalVariablesTable/localFun.kt` for JVM IR.

Also improved diagnosability of CheckLocalVariablesTableTest failures.

compiler/testData/checkLocalVariablesTable/localFun.kt

@@ -1,8 +1,18 @@
-// IGNORE_BACKEND: JVM_IR
 fun foo() {
+    val x = 1
     fun bar()  {
+        val y = x
     }
 }
 
+// Local function bodies are in a separate class (implementing FunctionN) for non-IR, and are static methods in the enclosing class for IR.
+
+// JVM_TEMPLATES
 // METHOD : LocalFunKt$foo$1.invoke()V
+// VARIABLE : NAME=y TYPE=I INDEX=1
 // VARIABLE : NAME=this TYPE=LLocalFunKt$foo$1; INDEX=0
+
+// JVM_IR_TEMPLATES
+// METHOD : LocalFunKt.foo$bar(I)V
+// VARIABLE : NAME=y TYPE=I INDEX=1
+// VARIABLE : NAME=$x TYPE=I INDEX=0