Adds support for the Cortex-A17 processor to Clang

Patch by Matthew Wahab.

llvm-svn: 219607
diff --git a/clang/lib/Driver/Tools.cpp b/clang/lib/Driver/Tools.cpp
index c060728..7689d28 100644
--- a/clang/lib/Driver/Tools.cpp
+++ b/clang/lib/Driver/Tools.cpp
@@ -5367,7 +5367,7 @@
     .Cases("arm1176jzf-s",  "mpcorenovfp",  "mpcore", "v6")
     .Cases("arm1156t2-s",  "arm1156t2f-s", "v6t2")
     .Cases("cortex-a5", "cortex-a7", "cortex-a8", "cortex-a9-mp", "v7")
-    .Cases("cortex-a9", "cortex-a12", "cortex-a15", "krait", "v7")
+    .Cases("cortex-a9", "cortex-a12", "cortex-a15", "cortex-a17", "krait", "v7")
     .Cases("cortex-r4", "cortex-r5", "v7r")
     .Case("cortex-m0", "v6m")
     .Case("cortex-m3", "v7m")