[PGO] Enable compression in pgo instrumentation

This reduces sizes of instrumented object files, final binaries,
process images, and raw profile data.

The format of the indexed profile data remain the same.

Differential Revision: http://reviews.llvm.org/D16388 
 

llvm-svn: 260117

1 files changed, 5 insertions, 0 deletions

diff --git a/llvm/lib/ProfileData/CoverageMappingReader.cpp b/llvm/lib/ProfileData/CoverageMappingReader.cpp
index 633de3202c2..617ec9e0ee1 100644
--- a/llvm/lib/ProfileData/CoverageMappingReader.cpp
+++ b/llvm/lib/ProfileData/CoverageMappingReader.cpp
@@ -426,6 +426,11 @@ std::unique_ptr<CovMapFuncRecordReader> CovMapFuncRecordReader::get(
   case CovMapVersion::Version1:
     return llvm::make_unique<VersionedCovMapFuncRecordReader<
         CovMapVersion::Version1, IntPtrT, Endian>>(P, R, F);
+  case CovMapVersion::Version2:
+    // Decompress the name data.
+    P.create(P.getNameData());
+    return llvm::make_unique<VersionedCovMapFuncRecordReader<
+        CovMapVersion::Version2, IntPtrT, Endian>>(P, R, F);
   }
   llvm_unreachable("Unsupported version");
 }