From 819e540208d5d62e7841d0dbdef3580eecc2c2b6 Mon Sep 17 00:00:00 2001
From: David Blaikie <dblaikie@gmail.com>
Date: Thu, 26 Mar 2020 20:09:14 -0700
Subject: [PATCH] Use llvm_unreachable after a fully covered/always-returning
 switch

---
 clang/lib/Basic/Targets/X86.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/clang/lib/Basic/Targets/X86.cpp b/clang/lib/Basic/Targets/X86.cpp
index 8a7d0f1..f06bf84 100644
--- a/clang/lib/Basic/Targets/X86.cpp
+++ b/clang/lib/Basic/Targets/X86.cpp
@@ -1842,7 +1842,7 @@ Optional<unsigned> X86TargetInfo::getCPUCacheLineSize() const {
     case CK_Generic:
       return None;
   }
-  return None;
+  llvm_unreachable("Unknown CPU kind");
 }
 
 bool X86TargetInfo::validateOutputSize(const llvm::StringMap<bool> &FeatureMap,
-- 
2.7.4