MIPS: Fix '[debug] implement intuitive semantics for stepping over await call.'

src/mips/builtins-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
 
 #include "src/codegen.h"
 #include "src/debug/debug.h"
 #include "src/deoptimizer.h"
 #include "src/full-codegen/full-codegen.h"
@@ skipping 836 matching lines @@
       ExternalReference::debug_step_in_enabled_address(masm->isolate());
   __ li(t1, Operand(step_in_enabled));
   __ lb(t1, MemOperand(t1));
   __ Branch(&prepare_step_in_if_stepping, ne, t1, Operand(zero_reg));
 
   // Flood function if we need to continue stepping in the suspended generator.
   ExternalReference debug_suspended_generator =
       ExternalReference::debug_suspended_generator_address(masm->isolate());
   __ li(t1, Operand(debug_suspended_generator));
   __ lw(t1, MemOperand(t1));
-  __ Branch(&prepare_step_in_suspended_generator, eq, t1, Operand(zero_reg));
+  __ Branch(&prepare_step_in_suspended_generator, eq, a1, Operand(t1));
   __ bind(&stepping_prepared);
 
   // Push receiver.
   __ lw(t1, FieldMemOperand(a1, JSGeneratorObject::kReceiverOffset));
   __ Push(t1);
 
   // ----------- S t a t e -------------
   //  -- a1    : the JSGeneratorObject to resume
   //  -- a2    : the resume mode (tagged)
   //  -- t0    : generator function
@@ skipping 2013 matching lines @@
   }
 }
 
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_MIPS