[wasm] Enable Liftoff everywhere

We rely on Liftoff for debugging, hence enable it everywhere by default.
This follows a chromium finch experiment and a CL to enable it
everywhere in chrome: https://crrev.com/c/2252100

R=ecmziegler@chromium.org

Bug: chromium:1040030
Change-Id: I3abbf915515883e6eb1f37501466290def57862d
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2252196Reviewed-by: Emanuel Ziegler <ecmziegler@chromium.org>
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#68431}

src/flags/flag-definitions.h

@@ -723,16 +723,8 @@ DEFINE_DEBUG_BOOL(trace_wasm_streaming, false,
 DEFINE_INT(trace_wasm_ast_start, 0,
            "start function for wasm AST trace (inclusive)")
 DEFINE_INT(trace_wasm_ast_end, 0, "end function for wasm AST trace (exclusive)")
-// Enable Liftoff by default on ia32 and x64. More architectures will follow
-// once they are implemented and sufficiently tested.
-#if V8_TARGET_ARCH_IA32 || V8_TARGET_ARCH_X64
 DEFINE_BOOL(liftoff, true,
             "enable Liftoff, the baseline compiler for WebAssembly")
-#else
-DEFINE_BOOL(liftoff, false,
-            "enable Liftoff, the baseline compiler for WebAssembly")
-DEFINE_IMPLICATION(future, liftoff)
-#endif
 // We can't tier up (from Liftoff to TurboFan) in single-threaded mode, hence
 // disable Liftoff in that configuration for now. The alternative is disabling
 // TurboFan, which would reduce peak performance considerably.