InstrProf: Remove a function that just returns its argument (NFC)

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@236664 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/ProfileData/CoverageMappingReader.h

@@ -80,12 +80,6 @@ class RawCoverageReader {
 protected:
   StringRef Data;
 
-  /// \brief Return the error code.
-  std::error_code error(std::error_code EC) { return EC; }
-
-  /// \brief Clear the current error code and return a successful one.
-  std::error_code success() { return error(instrprof_error::success); }
-
   RawCoverageReader(StringRef Data) : Data(Data) {}
 
   std::error_code readULEB128(uint64_t &Result);