Fix comment.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@131478 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Driver/Tools.cpp b/lib/Driver/Tools.cpp
index ffaa572..0086437 100644
--- a/lib/Driver/Tools.cpp
+++ b/lib/Driver/Tools.cpp
@@ -910,7 +910,7 @@
                              const ToolChain &TC) {
   if (TC.getTriple().getOS() == llvm::Triple::Darwin) {
     // The native darwin assembler doesn't support cfi directives, so
-    // we disable them if with think the .s file will be passed to it.
+    // we disable them if we think the .s file will be passed to it.
 
     // FIXME: Duplicated code with ToolChains.cpp
     // FIXME: This doesn't belong here, but ideally we will support static soon