[wasm] Add missing header needed for std::unique_ptr

This compilation error might happen without the header:
error: 'unique_ptr' in namespace 'std' does not name a template type

Change-Id: I103ce0496eff5dda85557410b4e7863c1c65aad0
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2873446Reviewed-by: Manos Koukoutos <manoskouk@chromium.org>
Commit-Queue: Milad Fa <mfarazma@redhat.com>
Cr-Commit-Position: refs/heads/master@{#74388}

src/wasm/wasm-init-expr.h

@@ -9,6 +9,8 @@
 #ifndef V8_WASM_WASM_INIT_EXPR_H_
 #define V8_WASM_WASM_INIT_EXPR_H_
 
+#include <memory>
+
 #include "src/wasm/value-type.h"
 
 namespace v8 {