[torque] disallow mostly unsupported vararg macros

Bug: v8:7929 v8:7793
Change-Id: I7d9cdd0fb3e36ae6e81683cc4c3746f6ea119d15
Reviewed-on: https://chromium-review.googlesource.com/1138077Reviewed-by: Daniel Clifford <danno@chromium.org>
Commit-Queue: Tobias Tebbi <tebbi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54564}

src/builtins/base.tq

@@ -644,7 +644,12 @@ extern macro IsElementsKindGreaterThan(
 extern macro LoadDoubleWithHoleCheck(FixedDoubleArray, Smi): float64
 labels IfHole;
 
-extern macro Call(Context, Callable, Object, ...): Object;
+extern macro Call(Context, Callable, Object): Object;
+extern macro Call(Context, Callable, Object, Object): Object;
+extern macro Call(Context, Callable, Object, Object, Object): Object;
+extern macro Call(Context, Callable, Object, Object, Object, Object): Object;
+extern macro Call(Context, Callable, Object, Object, Object, Object, Object): Object;
+extern macro Call(Context, Callable, Object, Object, Object, Object, Object, Object): Object;
 
 extern macro ExtractFixedArray(
     FixedArray, Smi, Smi, Smi, constexpr ExtractFixedArrayFlags): FixedArray;

src/torque/declarable.h

@@ -242,7 +242,11 @@ class Macro : public Callable {
  protected:
   Macro(Declarable::Kind type, const std::string& name,
         const Signature& signature)
-      : Callable(type, name, signature) {}
+      : Callable(type, name, signature) {
+    if (signature.parameter_types.var_args) {
+      ReportError("Varargs are not supported for macros.");
+    }
+  }
 
  private:
   friend class Declarations;