ittage: slightly modify altDiffers logic

src/main/scala/xiangshan/Bundle.scala

@@ -95,7 +95,6 @@ class CfiUpdateInfo(implicit p: Parameters) extends XSBundle with HasBPUParamete
     // this.hist := entry.ghist
     this.folded_hist := entry.folded_hist
     this.histPtr := entry.histPtr
-    this.ghr := entry.ghr
     this.rasSp := entry.rasSp
     this.rasEntry := entry.rasEntry
     this

src/main/scala/xiangshan/frontend/ITTAGE.scala

@@ -504,7 +504,7 @@ class ITTage(implicit p: Parameters) extends BaseITTage {
   resp_meta.provider.bits     := s2_provider
   resp_meta.altProvider.valid := s2_altProvided
   resp_meta.altProvider.bits  := s2_altProvider
-  resp_meta.altDiffers        := s2_finalAltPred =/= s2_tageTaken
+  resp_meta.altDiffers        := s2_finalAltPred =/= s2_tageTaken || s1_altProviderTarget =/= s2_providerTarget
   resp_meta.providerU         := s2_providerU
   resp_meta.providerCtr       := s2_providerCtr
   resp_meta.altProviderCtr    := s2_altProviderCtr