[ARM] Add ARMv8-M Baseline/Mainline LLVM targeting

llvm-svn: 257878
diff --git a/llvm/lib/Support/Triple.cpp b/llvm/lib/Support/Triple.cpp
index 0e5d3ac..eafcef1 100644
--- a/llvm/lib/Support/Triple.cpp
+++ b/llvm/lib/Support/Triple.cpp
@@ -521,6 +521,10 @@
     return Triple::ARMSubArch_v8_1a;
   case ARM::AK_ARMV8_2A:
     return Triple::ARMSubArch_v8_2a;
+  case ARM::AK_ARMV8MBaseline:
+    return Triple::ARMSubArch_v8m_baseline;
+  case ARM::AK_ARMV8MMainline:
+    return Triple::ARMSubArch_v8m_mainline;
   default:
     return Triple::NoSubArch;
   }