[wasm] Change the return type of traps for tests, and added ftoi64 instructions.

src/compiler/wasm-compiler.h

Index: src/compiler/wasm-compiler.h
diff --git a/src/compiler/wasm-compiler.h b/src/compiler/wasm-compiler.h
index 1841fc5c142d20ac4d8911204cab086172049f41..54d1dbd6b84373ce435f89999140ce76ace72d0f 100644
--- a/src/compiler/wasm-compiler.h
+++ b/src/compiler/wasm-compiler.h
@@ -55,7 +55,7 @@ Handle<JSFunction> CompileJSToWasmWrapper(Isolate* isolate,
 class WasmTrapHelper;
 class WasmGraphBuilder {
  public:
-  WasmGraphBuilder(Zone* z, JSGraph* g);
+  WasmGraphBuilder(Zone* z, JSGraph* g, wasm::FunctionSig* function_signature);
 
   Node** Buffer(size_t count) {
     if (count > cur_bufsize_) {
@@ -132,6 +132,8 @@ class WasmGraphBuilder {
 
   void set_effect_ptr(Node** effect) { this->effect_ = effect; }
 
+  wasm::FunctionSig* GetFunctionSignature() { return function_signature_; }
+
  private:
   static const int kDefaultBufferSize = 16;
   friend class WasmTrapHelper;
@@ -149,6 +151,7 @@ class WasmGraphBuilder {
   Node* def_buffer_[kDefaultBufferSize];
 
   WasmTrapHelper* trap_;
+  wasm::FunctionSig* function_signature_;
 
   // Internal helper methods.
   JSGraph* jsgraph() { return jsgraph_; }