PGO: seeing nonsensical counts and corrupted type handles

[AndyAyersMS]

See notes: #47790 (comment)

Suspect the copying done by getPgoInstrumentationResultsInstance is still off.

cc @davidwrighton

[dotnet-issue-labeler]

I couldn't figure out the best area label to add to this issue. If you have write-permissions please help me learn by adding exactly one area label.

[AndyAyersMS]

This fixes things for me (at least counts look good) ... not sure if it's the right fix overall:

-        volatile size_t*pSrc = (volatile size_t*)found->header.GetData();
+        volatile size_t*pSrc = (volatile size_t*)(found->header.GetData() + found->header.countsOffset);

[AndyAyersMS]

Added the above fix to #47959.