Update for following LLVM commit.

It will be:
Recommit 270977 - [llvm-mc] - Teach llvm-mc to generate zlib styled compression sections.

llvm-svn: 270985
diff --git a/clang/tools/driver/cc1as_main.cpp b/clang/tools/driver/cc1as_main.cpp
index 3ed1acd..60ef7c9 100644
--- a/clang/tools/driver/cc1as_main.cpp
+++ b/clang/tools/driver/cc1as_main.cpp
@@ -313,7 +313,7 @@
   // Ensure MCAsmInfo initialization occurs before any use, otherwise sections
   // may be created with a combination of default and explicit settings.
   if (Opts.CompressDebugSections)
-    MAI->setCompressDebugSections(true);
+    MAI->setCompressDebugSections(DebugCompressionType::DCT_ZlibGnu);
 
   bool IsBinary = Opts.OutputType == AssemblerInvocation::FT_Obj;
   std::unique_ptr<raw_fd_ostream> FDOS = getOutputStream(Opts, Diags, IsBinary);