[llvm-cov] Attempt to appease an older builder

It's using a version of clang which can't (or won't) deduce an implicit
conversion from a SmallString to a StringRef. Write the conversion out
explicitly:

  http://lab.llvm.org:8011/builders/lldb-x86_64-ubuntu-14.04-buildserver/builds/8574

llvm-svn: 275647
diff --git a/llvm/tools/llvm-cov/CodeCoverage.cpp b/llvm/tools/llvm-cov/CodeCoverage.cpp
index e9346cd..0a4d1a6 100644
--- a/llvm/tools/llvm-cov/CodeCoverage.cpp
+++ b/llvm/tools/llvm-cov/CodeCoverage.cpp
@@ -346,7 +346,9 @@
   for (const std::string &Arg : ViewOpts.DemanglerOpts)
     ArgsV.push_back(Arg.c_str());
   ArgsV.push_back(nullptr);
-  StringRef InputPathRef{InputPath}, OutputPathRef{OutputPath}, StderrRef;
+  StringRef InputPathRef = InputPath.str();
+  StringRef OutputPathRef = OutputPath.str();
+  StringRef StderrRef;
   const StringRef *Redirects[] = {&InputPathRef, &OutputPathRef, &StderrRef};
   std::string ErrMsg;
   int RC = sys::ExecuteAndWait(ViewOpts.DemanglerOpts[0], ArgsV.data(),