[promises] port NewPromiseCapability to TF

src/compiler/code-assembler.cc

Index: src/compiler/code-assembler.cc
diff --git a/src/compiler/code-assembler.cc b/src/compiler/code-assembler.cc
index 59220962c78a78bb09bd51271bfc2e6f171c71bc..3b937d6fd30fdd7a6f575aef7074a782e5a9c9da 100644
--- a/src/compiler/code-assembler.cc
+++ b/src/compiler/code-assembler.cc
@@ -72,6 +72,10 @@ CodeAssemblerState::CodeAssemblerState(Isolate* isolate, Zone* zone,
 
 CodeAssemblerState::~CodeAssemblerState() {}
 
+int CodeAssemblerState::parameter_count() const {
+  return static_cast<int>(raw_assembler_->call_descriptor()->ParameterCount());
+}
+
 CodeAssembler::~CodeAssembler() {}
 
 class BreakOnNodeDecorator final : public GraphDecorator {