Revert TastyFormat changes and fix Mima filters

Author: odersky

project/MiMaFilters.scala

@@ -13,6 +13,8 @@ object MiMaFilters {
         ProblemFilters.exclude[MissingFieldProblem]("scala.runtime.stdLibPatches.language#experimental.quotedPatternsWithPolymorphicFunctions"),
         ProblemFilters.exclude[MissingClassProblem]("scala.runtime.stdLibPatches.language$experimental$quotedPatternsWithPolymorphicFunctions$"),
         ProblemFilters.exclude[DirectMissingMethodProblem]("scala.quoted.runtime.Patterns.higherOrderHoleWithTypes"),
+        ProblemFilters.exclude[MissingClassProblem]("scala.annotation.internal.freshCapability"),
+        ProblemFilters.exclude[MissingClassProblem]("scala.annotation.internal.readOnlyCapability"),
       ),
 
       // Additions since last LTS

tasty/src/dotty/tools/tasty/TastyFormat.scala

@@ -229,7 +229,6 @@ Standard-Section: "ASTs" TopLevelStat*
                   OPEN                                                             -- an open class
                   INVISIBLE                                                        -- invisible during typechecking
                   TRACKED                                                          -- a tracked class parameter / a dependent class
-                  MUT                                                              -- an update method (cc only)
                   Annotation
 
   Variance      = STABLE                                                           -- invariant
@@ -512,7 +511,6 @@ object TastyFormat {
   final val EMPTYCLAUSE = 45
   final val SPLITCLAUSE = 46
   final val TRACKED = 47
-  final val MUT = 48
 
   // Tree Cat. 2:    tag Nat
   final val firstNatTreeTag = SHAREDterm
@@ -705,8 +703,7 @@ object TastyFormat {
        | ANNOTATION
        | PRIVATEqualified
        | PROTECTEDqualified
-       | TRACKED
-       | MUT => true
+       | TRACKED => true
     case _ => false
   }