Applied review suggestions

Author: szymon-rd

compiler/src/dotty/tools/backend/jvm/BackendUtils.scala

@@ -20,7 +20,7 @@ class BackendUtils(val postProcessor: PostProcessor) {
   import bTypes.*
   import coreBTypes.jliLambdaMetaFactoryAltMetafactoryHandle
 
-  lazy val classfileVersion: Int = BackendUtils.classfileVersionMap(compilerSettings.target)
+  lazy val classfileVersion: Int = BackendUtils.classfileVersionMap(compilerSettings.target.toInt)
 
   lazy val extraProc: Int = {
     import GenBCodeOps.addFlagIf
@@ -169,21 +169,21 @@ class BackendUtils(val postProcessor: PostProcessor) {
 }
 
 object BackendUtils {
-  lazy val classfileVersionMap = Map(
-    "8" -> asm.Opcodes.V1_8,
-    "9" -> asm.Opcodes.V9,
-    "10" -> asm.Opcodes.V10,
-    "11" -> asm.Opcodes.V11,
-    "12" -> asm.Opcodes.V12,
-    "13" -> asm.Opcodes.V13,
-    "14" -> asm.Opcodes.V14,
-    "15" -> asm.Opcodes.V15,
-    "16" -> asm.Opcodes.V16,
-    "17" -> asm.Opcodes.V17,
-    "18" -> asm.Opcodes.V18,
-    "19" -> asm.Opcodes.V19,
-    "20" -> asm.Opcodes.V20,
-    "21" -> asm.Opcodes.V21,
-    "22" -> asm.Opcodes.V22,
+  lazy val classfileVersionMap: Map[Int, Int] = Map(
+    8 -> asm.Opcodes.V1_8,
+    9 -> asm.Opcodes.V9,
+    10 -> asm.Opcodes.V10,
+    11 -> asm.Opcodes.V11,
+    12 -> asm.Opcodes.V12,
+    13 -> asm.Opcodes.V13,
+    14 -> asm.Opcodes.V14,
+    15 -> asm.Opcodes.V15,
+    16 -> asm.Opcodes.V16,
+    17 -> asm.Opcodes.V17,
+    18 -> asm.Opcodes.V18,
+    19 -> asm.Opcodes.V19,
+    20 -> asm.Opcodes.V20,
+    21 -> asm.Opcodes.V21,
+    22 -> asm.Opcodes.V22,
   )
 }