[wasm-gc] Enable speculative inlining when GC is enabled

This makes --experimental-wasm-gc imply --wasm-speculative-inlining,
which in turn implies --wasm-inlining and --wasm-dynamic-tiering as
prerequisites.
The former implication is weak, i.e. can be overridden on the command
line.

Bug: v8:7748
Change-Id: Iedc7c9916947f26e17bdd29dbf3b413dbaa05e6c
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3275571Reviewed-by: Manos Koukoutos <manoskouk@chromium.org>
Commit-Queue: Jakob Kummerow <jkummerow@chromium.org>
Cr-Commit-Position: refs/heads/main@{#77944}

src/flags/flag-definitions.h

@@ -1092,8 +1092,9 @@ DEFINE_BOOL(trace_wasm_inlining, false, "trace wasm inlining")
 DEFINE_BOOL(trace_wasm_speculative_inlining, false,
             "trace wasm speculative inlining")
 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_NEG_IMPLICATION(wasm_speculative_inlining, wasm_tier_up)
+DEFINE_WEAK_IMPLICATION(experimental_wasm_gc, wasm_speculative_inlining)
 DEFINE_BOOL(wasm_loop_unrolling, true,
             "enable loop unrolling for wasm functions")
 DEFINE_BOOL(wasm_fuzzer_gen_test, false,