Revert "Reapply "[ctx_profile] Profile reader and writer" (#92199)"

This reverts commit c19f2c7.

Broke the gcc-7 bot.

Author: joker-eph

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
@@ -22,7 +20,6 @@ add_llvm_component_library(LLVMProfileData
   intrinsics_gen
 
   LINK_COMPONENTS
-  BitstreamReader
   Core
   Object
   Support