Fix some errors introduced by rL370563 which were not exposed on my local machine.

1. zlib::compress accept &size_t but the param is an uint64_t.
2. Some systems don't have zlib installed. Don't use compression by default.

llvm-svn: 370564

1 files changed, 2 insertions, 1 deletions

diff --git a/llvm/lib/ProfileData/SampleProf.cpp b/llvm/lib/ProfileData/SampleProf.cpp
index 36c39c12432..e94848df24e 100644
--- a/llvm/lib/ProfileData/SampleProf.cpp
+++ b/llvm/lib/ProfileData/SampleProf.cpp
@@ -211,7 +211,8 @@ std::error_code ProfileSymbolList::read(uint64_t CompressSize,
     StringRef CompressedStrings(reinterpret_cast<const char *>(Data),
                                 CompressSize);
     char *Buffer = Allocator.Allocate<char>(UncompressSize);
-    llvm::Error E = zlib::uncompress(CompressedStrings, Buffer, UncompressSize);
+    size_t UCSize = UncompressSize;
+    llvm::Error E = zlib::uncompress(CompressedStrings, Buffer, UCSize);
     if (E)
       return sampleprof_error::uncompress_failed;
     ListStart = Buffer;