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

llvm-svn: 257878
diff --git a/llvm/lib/Target/ARM/ARMSubtarget.cpp b/llvm/lib/Target/ARM/ARMSubtarget.cpp
index c676f9f..bcffee1 100644
--- a/llvm/lib/Target/ARM/ARMSubtarget.cpp
+++ b/llvm/lib/Target/ARM/ARMSubtarget.cpp
@@ -113,6 +113,8 @@
   HasV8Ops = false;
   HasV8_1aOps = false;
   HasV8_2aOps = false;
+  HasV8MBaselineOps = false;
+  HasV8MMainlineOps = false;
   HasVFPv2 = false;
   HasVFPv3 = false;
   HasVFPv4 = false;