Rename FindExecutable to PrependMainExecutablePath.

Makes it more clear that it is just a path manipulation function.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@118174 91177308-0d34-0410-b5e6-96231b3b80d8

tools/bugpoint/OptimizerDriver.cpp

@@ -144,7 +144,8 @@ bool BugDriver::runPasses(Module *Program,
     return 1;
   }
 
-  sys::Path tool = FindExecutable("opt", getToolName(), (void*)"opt");
+  sys::Path tool = PrependMainExecutablePath("opt", getToolName(),
+                                             (void*)"opt");
   if (tool.empty()) {
     errs() << "Cannot find `opt' in executable directory!\n";
     return 1;