[wasm][liftoff][eh] Fix label allocation leak

The TryInfo is allocated in the zone and its destructor is never
called, so the catch_label allocated on the heap is never freed.
Add the Label as a non-pointer field of the TryInfo instead.

R=clemensb@chromium.org

Bug: chromium:1184925
Change-Id: Ic0246d15a6474c56a78f167eba51caca9ec5b453
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2739645
Commit-Queue: Thibaud Michaud <thibaudm@chromium.org>
Reviewed-by: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#73225}

src/wasm/baseline/liftoff-compiler.cc

@@ -373,7 +373,7 @@ class LiftoffCompiler {
   struct TryInfo {
     TryInfo() = default;
     LiftoffAssembler::CacheState catch_state;
-    MovableLabel catch_label;
+    Label catch_label;
     bool catch_reached = false;
     int32_t previous_catch = -1;
   };
@@ -1084,7 +1084,7 @@ class LiftoffCompiler {
       return;
     }
 
-    __ bind(block->try_info->catch_label.get());
+    __ bind(&block->try_info->catch_label);
     __ cache_state()->Steal(block->try_info->catch_state);
   }
 
@@ -3698,7 +3698,7 @@ class LiftoffCompiler {
       current_try->try_info->catch_reached = true;
     }
     __ MergeStackWith(current_try->try_info->catch_state, 0);
-    __ emit_jump(current_try->try_info->catch_label.get());
+    __ emit_jump(&current_try->try_info->catch_label);
 
     __ bind(&skip_handler);
   }