Revert "[wasm] --liftoff-only should disable --wasm-dynamic-tiering"

This reverts commit 54e360d1.

Reason for revert: Waterfall failures https://ci.chromium.org/ui/p/v8/builders/ci/V8%20Linux%20-%20debug/38922/overview

Original change's description:
> [wasm] --liftoff-only should disable --wasm-dynamic-tiering
>
> A Liftoff only configuration should never tier up to TurboFan, hence add
> a proper implication to disable dynamic tiering if --liftoff-only is
> set.
> Also, add a DCHECK to ensure we never accidentally compile with TurboFan
> if --liftoff-only is set.
>
> R=​jkummerow@chromium.org
>
> Bug: v8:12281
> Change-Id: Ia9b81add503cc939f59fde3f4d3bb67252facf2c
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3569741
> Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
> Commit-Queue: Clemens Backes <clemensb@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#79779}

Bug: v8:12281
Change-Id: Ie1551a9c7b4491cf02995acd0b72a276c2f68eab
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3572042
Auto-Submit: Leszek Swirski <leszeks@chromium.org>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Reviewed-by: Clemens Backes <clemensb@chromium.org>
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79781}

src/compiler/wasm-compiler.cc

@@ -8440,10 +8440,6 @@ wasm::WasmCompilationResult ExecuteTurbofanWasmCompilation(
     wasm::CompilationEnv* env, const wasm::WireBytesStorage* wire_byte_storage,
     const wasm::FunctionBody& func_body, int func_index, Counters* counters,
     wasm::WasmFeatures* detected) {
-  // Check that we do not accidentally compile a Wasm function to TurboFan if
-  // --liftoff-only is set.
-  DCHECK(!FLAG_liftoff_only);
-
   TRACE_EVENT2(TRACE_DISABLED_BY_DEFAULT("v8.wasm.detailed"),
                "wasm.CompileTopTier", "func_index", func_index, "body_size",
                func_body.end - func_body.start);

src/flags/flag-definitions.h

@@ -1011,7 +1011,6 @@ DEFINE_BOOL(liftoff_only, false,
             "disallow TurboFan compilation for WebAssembly (for testing)")
 DEFINE_IMPLICATION(liftoff_only, liftoff)
 DEFINE_NEG_IMPLICATION(liftoff_only, wasm_tier_up)
-DEFINE_NEG_IMPLICATION(liftoff_only, wasm_dynamic_tiering)
 DEFINE_NEG_IMPLICATION(fuzzing, liftoff_only)
 DEFINE_DEBUG_BOOL(
     enable_testing_opcode_in_wasm, false,