[liftoff] Remove redundant code comments

The {EnterFrame} and {LeaveFrame} methods will already emit a (scoped)
code comment in the form
  [ EnterFrame
   ... instructions ...
  ]

Thus skip the additional code comment emitted by Liftoff.

R=ahaas@chromium.org

Bug: v8:11879
Change-Id: I488568022cb03b16f07a12c1a575d90613691758
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2996197Reviewed-by: Andreas Haas <ahaas@chromium.org>
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#75479}

src/wasm/baseline/liftoff-compiler.cc

@@ -729,7 +729,6 @@ class LiftoffCompiler {
 
     __ CodeEntry();
 
-    CODE_COMMENT("enter frame");
     __ EnterFrame(StackFrame::WASM);
     __ set_has_frame(true);
     pc_offset_stack_frame_construction_ = __ PrepareStackFrame();
@@ -875,7 +874,6 @@ class LiftoffCompiler {
       // In this mode, we never generate stack checks.
       DCHECK(!is_stack_check);
       __ CallTrapCallbackForTesting();
-      CODE_COMMENT("leave frame");
       __ LeaveFrame(StackFrame::WASM);
       __ DropStackSlotsAndRet(
           static_cast<uint32_t>(descriptor_->ParameterSlotCount()));
@@ -2128,7 +2126,6 @@ class LiftoffCompiler {
     if (FLAG_trace_wasm) TraceFunctionExit(decoder);
     size_t num_returns = decoder->sig_->return_count();
     if (num_returns > 0) __ MoveToReturnLocations(decoder->sig_, descriptor_);
-    CODE_COMMENT("leave frame");
     __ LeaveFrame(StackFrame::WASM);
     __ DropStackSlotsAndRet(
         static_cast<uint32_t>(descriptor_->ParameterSlotCount()));