MIPS: Add missing cctests of DoubleToIStub (r16322).

src/mips/code-stubs-mips.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 665 matching lines @@
     // Load double input.
     __ ldc1(double_scratch, MemOperand(input_reg, double_offset));
 
     // Clear cumulative exception flags and save the FCSR.
     __ cfc1(scratch2, FCSR);
     __ ctc1(zero_reg, FCSR);
 
     // Try a conversion to a signed integer.
     __ Trunc_w_d(double_scratch, double_scratch);
     // Move the converted value into the result register.
-    __ mfc1(result_reg, double_scratch);
+    __ mfc1(scratch3, double_scratch);
 
     // Retrieve and restore the FCSR.
     __ cfc1(scratch, FCSR);
     __ ctc1(scratch2, FCSR);
 
     // Check for overflow and NaNs.
     __ And(
         scratch, scratch,
         kFCSROverflowFlagMask | kFCSRUnderflowFlagMask
            | kFCSRInvalidOpFlagMask);
-    // If we had no exceptions we are done.
-    __ Branch(&done, eq, scratch, Operand(zero_reg));
+    // If we had no exceptions then set result_reg and we are done.
+    Label error;
+    __ Branch(&error, ne, scratch, Operand(zero_reg));
+    __ Move(result_reg, scratch3);
+    __ Branch(&done);
+    __ bind(&error);
   }
 
   // Load the double value and perform a manual truncation.
   Register input_high = scratch2;
   Register input_low = scratch3;
 
   __ lw(input_low, MemOperand(input_reg, double_offset));
   __ lw(input_high, MemOperand(input_reg, double_offset + kIntSize));
 
   Label normal_exponent, restore_sign;
@@ skipping 5509 matching lines @@
   __ bind(&fast_elements_case);
   GenerateCase(masm, FAST_ELEMENTS);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_MIPS