fix warnings around size_t/int

src/gpu/GrTHashTable.h

Index: src/gpu/GrTHashTable.h
diff --git a/src/gpu/GrTHashTable.h b/src/gpu/GrTHashTable.h
index 83462c70c9e172889f03d6fb469078e2af2083db..9307425b9118ecac881009b1e59de43dd159a02b 100644
--- a/src/gpu/GrTHashTable.h
+++ b/src/gpu/GrTHashTable.h
@@ -61,7 +61,10 @@ private:
         kHashCount = 1 << kHashBits,
         kHashMask  = kHashCount - 1
     };
-    static unsigned hash2Index(uint32_t hash) {
+    static unsigned hash2Index(intptr_t hash) {
+        if (sizeof(hash) == 8) {
+            hash ^= hash >> 32;
+        }
         hash ^= hash >> 16;
         if (kHashBits <= 8) {
             hash ^= hash >> 8;