[ARM] Add missing M/R class CPUs

Add some of the missing M and R class Cortex CPUs, namely:

Cortex-M0+ (called Cortex-M0plus for GCC compatibility)
Cortex-M1
SC000
SC300
Cortex-R5

llvm-svn: 229661
diff --git a/clang/lib/Driver/Tools.cpp b/clang/lib/Driver/Tools.cpp
index 1c14908..6be4f51 100644
--- a/clang/lib/Driver/Tools.cpp
+++ b/clang/lib/Driver/Tools.cpp
@@ -5566,9 +5566,9 @@
     .Cases("arm1156t2-s",  "arm1156t2f-s", "v6t2")
     .Cases("cortex-a5", "cortex-a7", "cortex-a8", "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")
+    .Cases("cortex-r4", "cortex-r5", "cortex-r7", "v7r")
+    .Cases("sc000", "cortex-m0", "cortex-m0plus", "cortex-m1", "v6m")
+    .Cases("sc300", "cortex-m3", "v7m")
     .Cases("cortex-m4", "cortex-m7", "v7em")
     .Case("swift", "v7s")
     .Case("cyclone", "v8")