Fix typo in comments.

llvm-svn: 165216
diff --git a/clang/lib/Driver/Driver.cpp b/clang/lib/Driver/Driver.cpp
index 1897a63..212042e 100644
--- a/clang/lib/Driver/Driver.cpp
+++ b/clang/lib/Driver/Driver.cpp
@@ -1581,7 +1581,7 @@
 
 std::string Driver::GetFilePath(const char *Name, const ToolChain &TC) const {
   // Respect a limited subset of the '-Bprefix' functionality in GCC by
-  // attempting to use this prefix when lookup up program paths.
+  // attempting to use this prefix when looking for file paths.
   for (Driver::prefix_list::const_iterator it = PrefixDirs.begin(),
        ie = PrefixDirs.end(); it != ie; ++it) {
     std::string Dir(*it);
@@ -1625,7 +1625,7 @@
   // FIXME: Needs a better variable than DefaultTargetTriple
   std::string TargetSpecificExecutable(DefaultTargetTriple + "-" + Name);
   // Respect a limited subset of the '-Bprefix' functionality in GCC by
-  // attempting to use this prefix when lokup up program paths.
+  // attempting to use this prefix when looking for program paths.
   for (Driver::prefix_list::const_iterator it = PrefixDirs.begin(),
        ie = PrefixDirs.end(); it != ie; ++it) {
     llvm::sys::Path P(*it);