Randomize the seed used for string hashing. This helps guard against

src/mips/code-stubs-mips.cc

Index: src/mips/code-stubs-mips.cc
===================================================================
--- src/mips/code-stubs-mips.cc	(revision 10328)
+++ src/mips/code-stubs-mips.cc	(working copy)
@@ -5924,11 +5924,15 @@
 
 
 void StringHelper::GenerateHashInit(MacroAssembler* masm,
-                                      Register hash,
-                                      Register character) {
+                                    Register hash,
+                                    Register character) {
   // hash = character + (character << 10);

[Vyacheslav Egorov (Chromium), 2012/01/04 14:30:57]

comment is outdated

[Erik Corry, 2012/01/04 15:48:59]

Done.

-  __ sll(hash, character, 10);
+  __ LoadRoot(hash, Heap::kStringHashSeedRootIndex);
+  // Untag smi seed and add the character.
+  __ SmiUntag(hash);
   __ addu(hash, hash, character);
+  __ sll(at, hash, 10);
+  __ addu(hash, hash, at);
   // hash ^= hash >> 6;
   __ srl(at, hash, 6);
   __ xor_(hash, hash, at);
@@ -5936,8 +5940,8 @@
 
 
 void StringHelper::GenerateHashAddCharacter(MacroAssembler* masm,
-                                              Register hash,
-                                              Register character) {
+                                            Register hash,
+                                            Register character) {
   // hash += character;
   __ addu(hash, hash, character);
   // hash += hash << 10;