Add llvm_unreachable after fully covered switch to pacify GCC

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@180087 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Support/Compression.cpp b/lib/Support/Compression.cpp
index 497b17ec92b06b167a10d3c17aaed33f38b626a7..f22d3db9ac94423bd4f99961813e4dad52edd05f 100644 (file)
--- a/lib/Support/Compression.cpp
+++ b/lib/Support/Compression.cpp
@@ -31,6 +31,7 @@ static int encodeZlibCompressionLevel(zlib::CompressionLevel Level) {
     case zlib::DefaultCompression: return Z_DEFAULT_COMPRESSION;
     case zlib::BestSizeCompression: return 9;
   }
+  llvm_unreachable("Invalid zlib::CompressionLevel!");
 }
 
 static zlib::Status encodeZlibReturnValue(int ReturnValue) {