[wasm-gc] Enable decompression optimization

This gives a small speedup for wasm-gc programs.

Bug: v8:7748
Change-Id: I4a172251ab85e2a5e030ee5cae97db9e3655f5cd
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3654095Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
Commit-Queue: Manos Koukoutos <manoskouk@chromium.org>
Cr-Commit-Position: refs/heads/main@{#80632}

src/compiler/pipeline.cc

@@ -3250,6 +3250,12 @@ void Pipeline::GenerateCodeForWasmFunction(
   pipeline.Run<MemoryOptimizationPhase>();
   pipeline.RunPrintAndVerify(MemoryOptimizationPhase::phase_name(), true);
 
+  if (FLAG_experimental_wasm_gc) {
+    pipeline.Run<DecompressionOptimizationPhase>();
+    pipeline.RunPrintAndVerify(DecompressionOptimizationPhase::phase_name(),
+                               true);
+  }
+
   if (FLAG_turbo_splitting && !is_asm_js) {
     data.info()->set_splitting();
   }