[wasm] Disable spec. inlining by flag implications

--wasm-speculative-inlining makes no sense if --liftoff-only or
--no-liftoff, since it needs type feedback from Liftoff and is appied
by Turbofan. Therefore, it should be disabled in these cases.
Specifically, --wasm-speculative-inlining implies
--wasm-dynamic-tiering, which contradicts --liftoff-only.

Bug: v8:12166
Change-Id: Idc5e0d7ceb7dbdf82ea6fd14ffc8386fe35a1257
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3306554Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Manos Koukoutos <manoskouk@chromium.org>
Cr-Commit-Position: refs/heads/main@{#78200}

src/flags/flag-definitions.h

@@ -1101,6 +1101,11 @@ DEFINE_IMPLICATION(wasm_speculative_inlining, experimental_wasm_typed_funcref)
 DEFINE_IMPLICATION(wasm_speculative_inlining, wasm_dynamic_tiering)
 DEFINE_IMPLICATION(wasm_speculative_inlining, wasm_inlining)
 DEFINE_WEAK_IMPLICATION(experimental_wasm_gc, wasm_speculative_inlining)
+// Speculative inlining needs type feedback from Liftoff and compilation in
+// Turbofan.
+DEFINE_NEG_NEG_IMPLICATION(liftoff, wasm_speculative_inlining)
+DEFINE_NEG_IMPLICATION(liftoff_only, wasm_speculative_inlining)
+
 DEFINE_BOOL(wasm_loop_unrolling, true,
             "enable loop unrolling for wasm functions")
 DEFINE_BOOL(wasm_fuzzer_gen_test, false,

tools/testrunner/local/variants.py

@@ -73,7 +73,7 @@ INCOMPATIBLE_FLAGS_PER_VARIANT = {
   "stress": ["--always-opt", "--no-always-opt",
              "--max-inlined-bytecode-size=*",
              "--max-inlined-bytecode-size-cumulative=*", "--stress-inline",
-             "--liftoff-only"],
+             "--liftoff-only", "--wasm-speculative-inlining"],
   "sparkplug": ["--jitless"],
   "always_sparkplug": ["--jitless"],
   "code_serializer": ["--cache=after-execute", "--cache=full-code-cache",