[PGO] clean up and documentation

Introduce enum for indexed format versions and 
document indexed format change history.

llvm-svn: 257737

1 files changed, 1 insertions, 1 deletions

diff --git a/llvm/lib/ProfileData/InstrProfWriter.cpp b/llvm/lib/ProfileData/InstrProfWriter.cpp
index f5227248af2..44ad016f1a8 100644
--- a/llvm/lib/ProfileData/InstrProfWriter.cpp
+++ b/llvm/lib/ProfileData/InstrProfWriter.cpp
@@ -140,7 +140,7 @@ std::pair<uint64_t, uint64_t> InstrProfWriter::writeImpl(raw_ostream &OS) {
   // Write the header.
   IndexedInstrProf::Header Header;
   Header.Magic = IndexedInstrProf::Magic;
-  Header.Version = IndexedInstrProf::Version;
+  Header.Version = IndexedInstrProf::ProfVersion::CurrentVersion;
   Header.MaxFunctionCount = MaxFunctionCount;
   Header.HashType = static_cast<uint64_t>(IndexedInstrProf::HashType);
   Header.HashOffset = 0;