MIPS: Fix bug in elements transition code for smi to double transitions.

This fixes intermittent sin-cos test failures when corrupted values are returned
for referent sin and cos functions in test which require factorial value
to be calculated.

TEST=mjsunit/sin-cos
BUG=
R=balazs.kilvady@imgtec.com

Review URL: https://codereview.chromium.org/885923004

Cr-Commit-Position: refs/heads/master@{#26365}

src/mips/codegen-mips.cc

@@ -827,9 +827,9 @@ void ElementsTransitionGenerator::GenerateSmiToDouble(
   __ sw(hole_lower, MemOperand(scratch3, Register::kMantissaOffset));
   // exponent
   __ sw(hole_upper, MemOperand(scratch3, Register::kExponentOffset));
-  __ bind(&entry);
   __ addiu(scratch3, scratch3, kDoubleSize);
 
+  __ bind(&entry);
   __ Branch(&loop, lt, scratch3, Operand(array_end));
 
   __ bind(&done);