Make OnDiskChainedHashTableGenerator's Bucket type a POD type and reorder fields to optimize padding

For the common case of offset_type=unsigned this brings Bucket from 24 to 16
bytes.

llvm-svn: 234692

1 files changed, 2 insertions, 5 deletions

diff --git a/llvm/include/llvm/Support/OnDiskHashTable.h b/llvm/include/llvm/Support/OnDiskHashTable.h
index 52f133ccff6..0f097f28728 100644
--- a/llvm/include/llvm/Support/OnDiskHashTable.h
+++ b/llvm/include/llvm/Support/OnDiskHashTable.h
@@ -75,13 +75,10 @@ template <typename Info> class OnDiskChainedHashTableGenerator {
   llvm::SpecificBumpPtrAllocator<Item> BA;
 
   /// \brief A linked list of values in a particular hash bucket.
-  class Bucket {
-  public:
+  struct Bucket {
     offset_type Off;
-    Item *Head;
     unsigned Length;
-
-    Bucket() {}
+    Item *Head;
   };
 
   Bucket *Buckets;