[generators] Store the resume mode in the generator object.

src/full-codegen/mips/full-codegen-mips.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #if V8_TARGET_ARCH_MIPS
 
 // Note on Mips implementation:
 //
 // The result_register() for mips is the 'v0' register, which is defined
 // by the ABI to contain function return values. However, the first
@@ skipping 1824 matching lines @@
   SetExpressionPosition(expr);
 
   // Evaluate yielded value first; the initial iterator definition depends on
   // this.  It stays on the stack while we update the iterator.
   VisitForStackValue(expr->expression());
 
   Label suspend, continuation, post_runtime, resume, exception;
 
   __ jmp(&suspend);
   __ bind(&continuation);
-  // When we arrive here, the stack top is the resume mode and
-  // result_register() holds the input value (the argument given to the
-  // respective resume operation).
+  // When we arrive here, v0 holds the generator object.
   __ RecordGeneratorContinuation();
-  __ pop(a1);
+  __ lw(a1, FieldMemOperand(v0, JSGeneratorObject::kResumeModeOffset));
+  __ lw(v0, FieldMemOperand(v0, JSGeneratorObject::kInputOffset));
   __ Branch(&resume, eq, a1, Operand(Smi::FromInt(JSGeneratorObject::kNext)));
   __ Push(result_register());
   __ Branch(&exception, eq, a1,
             Operand(Smi::FromInt(JSGeneratorObject::kThrow)));
   EmitCreateIteratorResult(true);
   EmitUnwindAndReturn();
 
   __ bind(&exception);
   __ CallRuntime(Runtime::kThrow);
 
@@ skipping 2150 matching lines @@
          reinterpret_cast<uint32_t>(
              isolate->builtins()->OnStackReplacement()->entry()));
   return ON_STACK_REPLACEMENT;
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_MIPS