bpo-44479: Do not regenerate files during a PGO build as it will invalidate the profile. (GH-27460)

Author: zooba

PCbuild/regen.targets

@@ -78,7 +78,9 @@
           WorkingDirectory="$(PySourcePath)" />
   </Target>
 
-  <Target Name="Regen" DependsOnTargets="_TouchRegenSources;_RegenPegen;_RegenAST_H;_RegenOpcodes;_RegenTokens;_RegenKeywords">
+  <Target Name="Regen"
+          Condition="$(Configuration) != 'PGUpdate'"
+          DependsOnTargets="_TouchRegenSources;_RegenPegen;_RegenAST_H;_RegenOpcodes;_RegenTokens;_RegenKeywords">
     <Message Text="Generated sources are up to date" Importance="high" />
   </Target>
 
@@ -119,5 +121,7 @@
     <Message Text="Wrote $(OutDir)LICENSE.txt" Importance="high" />
   </Target>
 
-  <Target Name="PostBuildRegen" DependsOnTargets="_RegenTestFrozenmain;_RegenLicense" />
+  <Target Name="PostBuildRegen"
+          Condition="$(Configuration) != 'PGInstrument' and $(Configuration) != 'PGUpdate'"
+          DependsOnTargets="_RegenTestFrozenmain;_RegenLicense" />
 </Project>