Merge V8 at r10446: Roll to 3.6.6.19

Bug: 5688872
Change-Id: Ie6be41e043db4e38abeb6b8d92761d7cc2c294bf
diff --git a/src/mips/code-stubs-mips.cc b/src/mips/code-stubs-mips.cc
index 6e0a236..c3c3874 100644
--- a/src/mips/code-stubs-mips.cc
+++ b/src/mips/code-stubs-mips.cc
@@ -5580,7 +5580,7 @@
                                     Register hash,
                                     Register character) {
   // hash = seed + character + ((seed + character) << 10);
-  __ LoadRoot(hash, Heap::kStringHashSeedRootIndex);
+  __ LoadRoot(hash, Heap::kHashSeedRootIndex);
   // Untag smi seed and add the character.
   __ SmiUntag(hash);
   __ addu(hash, hash, character);