[Coverage] Fix a warning

This patch fixes:

  llvm/lib/ProfileData/Coverage/CoverageMapping.cpp:219:5: error:
  default label in switch which covers all enumeration values
  [-Werror,-Wcovered-switch-default]

1 files changed, 0 insertions, 2 deletions

diff --git a/llvm/lib/ProfileData/Coverage/CoverageMapping.cpp b/llvm/lib/ProfileData/Coverage/CoverageMapping.cpp
index d62bf02..f8466bc 100644
--- a/llvm/lib/ProfileData/Coverage/CoverageMapping.cpp
+++ b/llvm/lib/ProfileData/Coverage/CoverageMapping.cpp
@@ -216,8 +216,6 @@ Expected<int64_t> CounterMappingContext::evaluate(const Counter &C) const {
       }
       break;
     }
-    default:
-      llvm_unreachable("Unhandled CounterKind");
     }
   }