[wasm] Fix bounds check for zero initial memory.

src/ppc/assembler-ppc.cc

Index: src/ppc/assembler-ppc.cc
diff --git a/src/ppc/assembler-ppc.cc b/src/ppc/assembler-ppc.cc
index 08a8005ee1a27db09eede1ea44cd8b452c593635..e585fee97a3f57fa0f58fa719d80b0c55ba9a150 100644
--- a/src/ppc/assembler-ppc.cc
+++ b/src/ppc/assembler-ppc.cc
@@ -171,6 +171,11 @@ Address RelocInfo::wasm_global_reference() {
   return Assembler::target_address_at(pc_, host_);
 }
 
+uint8_t RelocInfo::wasm_memtype_size_reference() {
+  DCHECK(IsWasmMemtypeSizeReference(rmode_));
+  return static_cast<uint8_t>(
+      reinterpret_cast<intptr_t>(Assembler::target_address_at(pc_, host_)));
+}
 
 void RelocInfo::unchecked_update_wasm_memory_reference(
     Address address, ICacheFlushMode flush_mode) {