[X86] Delete Profile Guided Prefetch Passes (#167317)

As the PGPF effort has been turned down, there is no current way to
generate profiles that will be used by these passes. Current efforts are
also focused around inserting prefetches in PLO optimizers, which have a
more accurate view of how the code looks.

Author: boomanaiden154

llvm/lib/Target/X86/CMakeLists.txt

@@ -31,7 +31,6 @@ set(sources
   X86CmovConversion.cpp
   X86CodeGenPassBuilder.cpp
   X86DomainReassignment.cpp
-  X86DiscriminateMemOps.cpp
   X86LowerTileCopy.cpp
   X86LowerAMXType.cpp
   X86LowerAMXIntrinsics.cpp
@@ -57,7 +56,6 @@ set(sources
   X86IndirectBranchTracking.cpp
   X86IndirectThunks.cpp
   X86InterleavedAccess.cpp
-  X86InsertPrefetch.cpp
   X86InstCombineIntrinsic.cpp
   X86InstrFMA3Info.cpp
   X86InstrFoldTables.cpp

llvm/lib/Target/X86/X86.h

@@ -166,13 +166,6 @@ FunctionPass *createX86IndirectThunksPass();
 /// This pass replaces ret instructions with jmp's to __x86_return thunk.
 FunctionPass *createX86ReturnThunksPass();
 
-/// This pass ensures instructions featuring a memory operand
-/// have distinctive <LineNumber, Discriminator> (with respect to each other)
-FunctionPass *createX86DiscriminateMemOpsPass();
-
-/// This pass applies profiling information to insert cache prefetches.
-FunctionPass *createX86InsertPrefetchPass();
-
 /// This pass insert wait instruction after X87 instructions which could raise
 /// fp exceptions when strict-fp enabled.
 FunctionPass *createX86InsertX87waitPass();