Backport "Update asm to patched 9.7" to LTS (#22111)

Backports #20144 to the 3.3.5.

PR submitted by the release tooling.
[skip ci]

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

@@ -20,24 +20,7 @@ class BackendUtils(val postProcessor: PostProcessor) {
   import bTypes.*
   import coreBTypes.jliLambdaMetaFactoryAltMetafactoryHandle
 
-  // Keep synchronized with `minTargetVersion` and `maxTargetVersion` in ScalaSettings
-  lazy val classfileVersion: Int = compilerSettings.target match {
-    case "8"  => asm.Opcodes.V1_8
-    case "9"  => asm.Opcodes.V9
-    case "10" => asm.Opcodes.V10
-    case "11" => asm.Opcodes.V11
-    case "12" => asm.Opcodes.V12
-    case "13" => asm.Opcodes.V13
-    case "14" => asm.Opcodes.V14
-    case "15" => asm.Opcodes.V15
-    case "16" => asm.Opcodes.V16
-    case "17" => asm.Opcodes.V17
-    case "18" => asm.Opcodes.V18
-    case "19" => asm.Opcodes.V19
-    case "20" => asm.Opcodes.V20
-    case "21" => asm.Opcodes.V21
-    case "22" => asm.Opcodes.V22
-  }
+  lazy val classfileVersion: Int = BackendUtils.classfileVersionMap(compilerSettings.target.toInt)
 
   lazy val extraProc: Int = {
     import GenBCodeOps.addFlagIf
@@ -184,3 +167,24 @@ class BackendUtils(val postProcessor: PostProcessor) {
     }
   }
 }
+
+object BackendUtils {
+  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,
+    23 -> asm.Opcodes.V23
+  )
+}

project/Build.scala

@@ -580,7 +580,7 @@ object Build {
 
       // get libraries onboard
       libraryDependencies ++= Seq(
-        "org.scala-lang.modules" % "scala-asm" % "9.6.0-scala-1", // used by the backend
+        "org.scala-lang.modules" % "scala-asm" % "9.7.0-scala-2", // used by the backend
         Dependencies.compilerInterface,
         "org.jline" % "jline-reader" % "3.25.1",   // used by the REPL
         "org.jline" % "jline-terminal" % "3.25.1",

tests/pos-with-compiler-cc/dotc/config/ScalaSettings.scala

@@ -17,7 +17,7 @@ class ScalaSettings extends SettingGroup with AllScalaSettings
 object ScalaSettings:
   // Keep synchronized with `classfileVersion` in `BCodeIdiomatic`
   private val minTargetVersion = 8
-  private val maxTargetVersion = 22
+  private val maxTargetVersion = 23
 
   def supportedTargetVersions: List[String] =
     (minTargetVersion to maxTargetVersion).toList.map(_.toString)