[wasm] Replace WasmName by Vector<const char>

src/wasm/wasm-module.h

Index: src/wasm/wasm-module.h
diff --git a/src/wasm/wasm-module.h b/src/wasm/wasm-module.h
index 78b780ace04bb5b87898cf301f771a8f6aaa29ac..1a328262cd901430a4d263ebc7be8fdc0b3e04bc 100644
--- a/src/wasm/wasm-module.h
+++ b/src/wasm/wasm-module.h
@@ -193,14 +193,18 @@ struct WasmModule {
   WasmName GetName(uint32_t offset, uint32_t length) const {
     if (length == 0) return {"<?>", 3};  // no name.
     CHECK(BoundsCheck(offset, offset + length));
-    return {reinterpret_cast<const char*>(module_start + offset), length};
+    DCHECK_GE(static_cast<int>(length), 0);
+    return {reinterpret_cast<const char*>(module_start + offset),
+            static_cast<int>(length)};
   }
 
   // Get a string stored in the module bytes representing a name.
   WasmName GetNameOrNull(uint32_t offset, uint32_t length) const {
     if (length == 0) return {NULL, 0};  // no name.
     CHECK(BoundsCheck(offset, offset + length));
-    return {reinterpret_cast<const char*>(module_start + offset), length};
+    DCHECK_GE(static_cast<int>(length), 0);
+    return {reinterpret_cast<const char*>(module_start + offset),
+            static_cast<int>(length)};
   }
 
   // Checks the given offset range is contained within the module bytes.