Put all LLVM code into the llvm namespace, as per bug 109.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@9903 91177308-0d34-0410-b5e6-96231b3b80d8

tools/bugpoint/OptimizerDriver.cpp

@@ -26,6 +26,8 @@
 #include <sys/types.h>
 #include <sys/wait.h>
 
+namespace llvm {
+
 /// writeProgramToFile - This writes the current "Program" to the named bytecode
 /// file.  If an error occurs, true is returned.
 ///
@@ -159,3 +161,5 @@ bool BugDriver::runPasses(const std::vector<const PassInfo*> &Passes,
   // Was the child successful?
   return !ExitedOK;
 }
+
+} // End llvm namespace