Changed hash table to use more of the hash value when probing.

src/utils.h

Index: src/utils.h
===================================================================
--- src/utils.h	(revision 2481)
+++ src/utils.h	(working copy)
@@ -212,6 +212,21 @@
 
 
 // ----------------------------------------------------------------------------
+// Bitwise rotate word
+
+inline uint32_t RotateRight(uint32_t value, uint32_t n) {
+  ASSERT(n < 31);
+  return (value >> n) | (value << (32-n));
+}
+
+
+inline uint32_t RotateLeft(uint32_t value, uint32_t n) {
+  ASSERT(n < 31);
+  return (value << n) | (value >> (32-n));
+}
+
+
+// ----------------------------------------------------------------------------
 // I/O support.
 
 // Our version of printf(). Avoids compilation errors that we get