drop more llvm:: prefixes on SmallString<>

More cleanup after r149799.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@150380 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/examples/clang-interpreter/main.cpp b/examples/clang-interpreter/main.cpp
index d0db740..ce5c5f9 100644
--- a/examples/clang-interpreter/main.cpp
+++ b/examples/clang-interpreter/main.cpp
@@ -93,7 +93,7 @@
   // failed. Extract that job from the compilation.
   const driver::JobList &Jobs = C->getJobs();
   if (Jobs.size() != 1 || !isa<driver::Command>(*Jobs.begin())) {
-    llvm::SmallString<256> Msg;
+    SmallString<256> Msg;
     llvm::raw_svector_ostream OS(Msg);
     C->PrintJob(OS, C->getJobs(), "; ", true);
     Diags.Report(diag::err_fe_expected_compiler_job) << OS.str();