Fix template deduction guide for WasmSectionIterator

The previous declaration was failing on GCC, because the argument types
did not match the actual constructor. The second parameter needs to be a
reference.

R=jkummerow@chromium.org

Bug: v8:13069
Change-Id: I151b44e05cd8b45da8f737ab84da063e491f3292
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3779683Reviewed-by: Andreas Haas <ahaas@chromium.org>
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/main@{#81866}

src/wasm/module-decoder-impl.h

@@ -299,7 +299,7 @@ class WasmSectionIterator {
 
 // Add an explicit template deduction guide for {WasmSectionIterator}.
 template <class T>
-WasmSectionIterator(Decoder*, T) -> WasmSectionIterator<T>;
+WasmSectionIterator(Decoder*, T&) -> WasmSectionIterator<T>;
 
 // The main logic for decoding the bytes of a module.
 template <class Tracer>