[llvm] r334455 - Fix a buildbot error reported by sanitizer-x86_64-linux-fast:

[Wei Mi via llvm-commits]

Author: wmi
Date: Mon Jun 11 16:39:02 2018
New Revision: 334455

URL: http://llvm.org/viewvc/llvm-project?rev=334455&view=rev
Log:
Fix a buildbot error reported by sanitizer-x86_64-linux-fast:
Function::getGUID may complain if its input is an empty StringRef.

Modified:
    llvm/trunk/include/llvm/ProfileData/SampleProf.h

Modified: llvm/trunk/include/llvm/ProfileData/SampleProf.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/ProfileData/SampleProf.h?rev=334455&r1=334454&r2=334455&view=diff
==============================================================================
--- llvm/trunk/include/llvm/ProfileData/SampleProf.h (original)
+++ llvm/trunk/include/llvm/ProfileData/SampleProf.h Mon Jun 11 16:39:02 2018
@@ -97,6 +97,8 @@ static inline uint64_t SPMagic(SamplePro
 static inline StringRef getRepInFormat(StringRef Name,
                                        SampleProfileFormat Format,
                                        std::string &GUIDBuf) {
+  if (Name.empty())
+    return Name;
   GUIDBuf = std::to_string(Function::getGUID(Name));
   return (Format == SPF_Compact_Binary) ? StringRef(GUIDBuf) : Name;
 }