ARM64: Fix cache line size computation.

src/arm64/cpu-arm64.cc

Index: src/arm64/cpu-arm64.cc
diff --git a/src/arm64/cpu-arm64.cc b/src/arm64/cpu-arm64.cc
index 4f69be9d274ee9625d3cbabf568bc2bed38862b4..325eb6efb0cf6ce7df614966fef28608a4b8ea7c 100644
--- a/src/arm64/cpu-arm64.cc
+++ b/src/arm64/cpu-arm64.cc
@@ -39,8 +39,9 @@ class CacheLineSizes {
 
  private:
   uint32_t ExtractCacheLineSize(int cache_line_size_shift) const {
-    // The cache type register holds the size of the caches as a power of two.
-    return 1 << ((cache_type_register_ >> cache_line_size_shift) & 0xf);
+    // The cache type register holds the size of cache lines in words as a
+    // power of two.
+    return 4 << ((cache_type_register_ >> cache_line_size_shift) & 0xf);
   }
 
   uint32_t cache_type_register_;