Typo spotted by Ivan Krasin.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@138200 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Driver/HostInfo.cpp b/lib/Driver/HostInfo.cpp
index 3b1c2c7..292678b 100644
--- a/lib/Driver/HostInfo.cpp
+++ b/lib/Driver/HostInfo.cpp
@@ -188,7 +188,7 @@
 ToolChain *UnknownHostInfo::CreateToolChain(const ArgList &Args,
                                             const char *ArchName) const {
   assert(!ArchName &&
-         "Unexpected arch name on platform without driver driver support.");
+         "Unexpected arch name on platform without driver support.");
 
   // Automatically handle some instances of -m32/-m64 we know about.
   std::string Arch = getArchName();