Fix merge breakage

Author: odersky

compiler/src/dotty/tools/dotc/core/Types.scala

@@ -4175,12 +4175,12 @@ object Types {
       myGround > 0
 
     private[Types] def cachedIsStable(using Context): Boolean =
-      if myisStableRunId != ctx.runId then
+      if myIsStableRunId != ctx.runId then
         val res: Boolean = computeIsStable
         // We don't cache if the type is provisional because `Type#isStable`
         // calls `Type#stripTypeVar` which might return different results later.
         if !isProvisional then
-          myisStableRunId = ctx.runId
+          myIsStableRunId = ctx.runId
           myIsStable = res
         res
       else