[wasm][asm.js] Ensure final validation phase runs.

src/asmjs/asm-typer.h

Index: src/asmjs/asm-typer.h
diff --git a/src/asmjs/asm-typer.h b/src/asmjs/asm-typer.h
index 723731bcdd309c203ef5de69c93dd7a85ebb28a8..8ddcb34b0ff17d35bc2dc9fea7bb94da3c39acf6 100644
--- a/src/asmjs/asm-typer.h
+++ b/src/asmjs/asm-typer.h
@@ -86,6 +86,10 @@ class AsmTyper final {
   AsmType* TypeOf(Variable* v) const;
   StandardMember VariableAsStandardMember(Variable* var);
 
+  // Allow the asm-wasm-builder to trigger failures (for interleaved
+  // validating).
+  AsmType* FailWithMessage(const char* text);
+
   typedef std::unordered_set<StandardMember, std::hash<int> > StdlibSet;
 
   StdlibSet StdlibUses() const { return stdlib_uses_; }