Revert r347596 "Support for inserting profile-directed cache prefetches"

It causes asserts building BoringSSL. See https://crbug.com/91009#c3 for
repro.

This also reverts the follow-ups:
Revert r347724 "Do not insert prefetches with unsupported memory operands."
Revert r347606 "[X86] Add dependency from X86 to ProfileData after rL347596"
Revert r347607 "Add new passes to X86 pipeline tests"

llvm-svn: 347864

Author: zmodem

llvm/lib/Target/X86/CMakeLists.txt

@@ -30,7 +30,6 @@ set(sources
   X86CmovConversion.cpp
   X86CondBrFolding.cpp
   X86DomainReassignment.cpp
-  X86DiscriminateMemOps.cpp
   X86ExpandPseudo.cpp
   X86FastISel.cpp
   X86FixupBWInsts.cpp
@@ -45,7 +44,6 @@ set(sources
   X86ISelLowering.cpp
   X86IndirectBranchTracking.cpp
   X86InterleavedAccess.cpp
-  X86InsertPrefetch.cpp
   X86InstrFMA3Info.cpp
   X86InstrFoldTables.cpp
   X86InstrInfo.cpp

llvm/lib/Target/X86/LLVMBuild.txt

@@ -31,5 +31,5 @@ has_jit = 1
 type = Library
 name = X86CodeGen
 parent = X86
-required_libraries = Analysis AsmPrinter CodeGen Core MC SelectionDAG Support Target X86AsmPrinter X86Desc X86Info X86Utils GlobalISel ProfileData
+required_libraries = Analysis AsmPrinter CodeGen Core MC SelectionDAG Support Target X86AsmPrinter X86Desc X86Info X86Utils GlobalISel
 add_to_library_groups = X86

llvm/lib/Target/X86/X86.h

@@ -122,13 +122,6 @@ FunctionPass *createX86EvexToVexInsts();
 /// This pass creates the thunks for the retpoline feature.
 FunctionPass *createX86RetpolineThunksPass();
 
-/// This pass ensures instructions featuring a memory operand
-/// have distinctive <LineNumber, Discriminator> (with respect to eachother)
-FunctionPass *createX86DiscriminateMemOpsPass();
-
-/// This pass applies profiling information to insert cache prefetches.
-FunctionPass *createX86InsertPrefetchPass();
-
 InstructionSelector *createX86InstructionSelector(const X86TargetMachine &TM,
                                                   X86Subtarget &,
                                                   X86RegisterBankInfo &);