Index: llvm/include/llvm/Support/DJB.h
===================================================================
--- llvm/include/llvm/Support/DJB.h
+++ llvm/include/llvm/Support/DJB.h
@@ -18,10 +18,10 @@
 namespace llvm {
 
 /// The Bernstein hash function used by the DWARF accelerator tables.
-inline uint32_t djbHash(StringRef Buffer, uint32_t H = 5381) {
+inline uint32_t djbHash(StringRef Buffer, uint64_t H = 5381) {
   for (unsigned char C : Buffer.bytes())
-    H = (H << 5) + H + C;
-  return H;
+    H = ((H & 0xFFFFFFFF) << 5) + H + C;
+  return static_cast<uint32_t>(H);
 }
 
 /// Computes the Bernstein hash after folding the input according to the Dwarf 5