Shorten or normalize phase name

Author: som-snytt

compiler/src/dotty/tools/dotc/semanticdb/ExtractSemanticDB.scala

@@ -49,7 +49,12 @@ import java.nio.file.Path
  */
 class ExtractSemanticDB private (phaseMode: ExtractSemanticDB.PhaseMode) extends Phase:
 
-  override val phaseName: String = ExtractSemanticDB.phaseNamePrefix + phaseMode.toString()
+  override val phaseName: String = s"""${ExtractSemanticDB.phaseNamePrefix}${
+    import ExtractSemanticDB.PhaseMode.*
+    phaseMode match
+      case ExtractSemanticInfo => "ExtractInfo"
+      case AppendDiagnostics   => "AppendDiag"
+  }"""
 
   override val description: String = ExtractSemanticDB.description
 
@@ -129,7 +134,7 @@ object ExtractSemanticDB:
   import java.nio.file.Files
   import java.nio.file.Paths
 
-  val phaseNamePrefix: String = "extractSemanticDB"
+  val phaseNamePrefix: String = "semanticDB"
   val description: String = "extract info into .semanticdb files"
 
   enum PhaseMode:

compiler/src/dotty/tools/dotc/transform/CollectEntryPoints.scala

@@ -49,5 +49,5 @@ class CollectEntryPoints extends MiniPhase:
   }
 
 object CollectEntryPoints:
-  val name: String = "Collect entry points"
+  val name: String = "collectEntryPoints"
   val description: String = "collect all entry points and save them in the context"

compiler/src/dotty/tools/dotc/transform/SetRootTree.scala

@@ -44,6 +44,6 @@ class SetRootTree extends Phase {
 }
 
 object SetRootTree {
-  val name: String = "SetRootTree"
+  val name: String = "setRootTree"
   val description: String = "set the rootTreeOrProvider on class symbols"
 }