Revert "[ctx_profile] Profile reader and writer (#91859)"

This reverts commit dfdc3dc.

Author: mtrofin

llvm/include/llvm/ProfileData/PGOCtxProfReader.h

@@ -7,8 +7,6 @@ add_llvm_component_library(LLVMProfileData
   ItaniumManglingCanonicalizer.cpp
   MemProf.cpp
   MemProfReader.cpp
-  PGOCtxProfReader.cpp
-  PGOCtxProfWriter.cpp
   ProfileSummaryBuilder.cpp
   SampleProf.cpp
   SampleProfReader.cpp