[generators] Create the fixed array holding the registers only once.

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 eccba20e96f8f0ac4155d017f38b4f81056d66a6..147ba502875e3bcb93e732564ffb369f8a86da1d 100644
--- a/src/interpreter/interpreter-assembler.h
+++ b/src/interpreter/interpreter-assembler.h
@@ -53,8 +53,8 @@ class InterpreterAssembler : public CodeStubAssembler {
   // Number of registers.
   compiler::Node* RegisterCount();
 
-  // Backup/restore register file to/from a fixed array.
-  compiler::Node* ExportRegisterFile();
+  // Backup/restore register file to/from a fixed array of the correct length.
+  compiler::Node* ExportRegisterFile(compiler::Node* array);
   compiler::Node* ImportRegisterFile(compiler::Node* array);
 
   // Loads from and stores to the interpreter register file.