Introduce bytecodes for assisting generator suspend and resume.

src/interpreter/interpreter-assembler.h

Index: src/interpreter/interpreter-assembler.h
diff --git a/src/interpreter/interpreter-assembler.h b/src/interpreter/interpreter-assembler.h
index 03a6a97c4ed74bd895fab53eaed174d451e878e4..5b29b63c2c859bd579722312cad61cd7b7d43bec 100644
--- a/src/interpreter/interpreter-assembler.h
+++ b/src/interpreter/interpreter-assembler.h
@@ -50,6 +50,13 @@ class InterpreterAssembler : public CodeStubAssembler {
   compiler::Node* GetContext();
   void SetContext(compiler::Node* value);
 
+  // Number of registers.
+  compiler::Node* RegisterCount();
+
+  // Backup/restore register file to/from a fixed array.
+  compiler::Node* ExportRegisterFile();
+  compiler::Node* ImportRegisterFile(compiler::Node* array);
+
   // Loads from and stores to the interpreter register file.
   compiler::Node* LoadRegister(Register reg);
   compiler::Node* LoadRegister(compiler::Node* reg_index);
@@ -67,9 +74,6 @@ class InterpreterAssembler : public CodeStubAssembler {
   // Load constant at |index| in the constant pool.
   compiler::Node* LoadConstantPoolEntry(compiler::Node* index);
 
-  // Load a field from an object on the heap.
-  compiler::Node* LoadObjectField(compiler::Node* object, int offset);
-
   // Load |slot_index| from |context|.
   compiler::Node* LoadContextSlot(compiler::Node* context, int slot_index);
   compiler::Node* LoadContextSlot(compiler::Node* context,