Revert 12069: Implements a new API to set a function entry hook for profiling

src/x64/code-stubs-x64.cc

Index: src/x64/code-stubs-x64.cc
diff --git a/src/x64/code-stubs-x64.cc b/src/x64/code-stubs-x64.cc
index 28157ddb77360e323aab7d37e6c60e1bf82c16c3..ecdb3926c04dfb321a739312128ed5991904d5af 100644
--- a/src/x64/code-stubs-x64.cc
+++ b/src/x64/code-stubs-x64.cc
@@ -6420,40 +6420,6 @@ void StoreArrayLiteralElementStub::Generate(MacroAssembler* masm) {
   __ ret(0);
 }
 
-
-void ProfileEntryHookStub::MaybeCallEntryHook(MacroAssembler* masm) {
-  if (entry_hook_ != NULL) {
-    ProfileEntryHookStub stub;
-    masm->CallStub(&stub);
-  }
-}
-
-
-void ProfileEntryHookStub::Generate(MacroAssembler* masm) {
-  // RCX is the only volatile register we must save.
-  __ push(rcx);
-
-  // Calculate the original stack pointer and store it in RDX, the second arg.
-  __ lea(rdx, Operand(rsp, kPointerSize));
-
-  // Calculate the function address to RCX, the first arg.
-  __ movq(rcx, Operand(rdx, 0));
-  __ subq(rcx, Immediate(Assembler::kShortCallInstructionLength));
-
-  // Reserve stack for the first 4 args.
-  __ subq(rsp, Immediate(4 * kPointerSize));
-
-  // Call the entry hook.
-  int64_t hook_location = reinterpret_cast<int64_t>(&entry_hook_);
-  __ movq(rax, hook_location, RelocInfo::NONE);
-  __ call(Operand(rax, 0));
-  __ addq(rsp, Immediate(4 * kPointerSize));
-
-  // Restore RCX.
-  __ pop(rcx);
-  __ ret(0);
-}
-
 #undef __
 
 } }  // namespace v8::internal