[ARM] Add ACLE feature macros for MVE.

Fixup uninitialised variable.

llvm-svn: 362814
diff --git a/clang/lib/Basic/Targets/ARM.cpp b/clang/lib/Basic/Targets/ARM.cpp
index d9028f8..549cb1f 100644
--- a/clang/lib/Basic/Targets/ARM.cpp
+++ b/clang/lib/Basic/Targets/ARM.cpp
@@ -400,6 +400,7 @@
 bool ARMTargetInfo::handleTargetFeatures(std::vector<std::string> &Features,
                                          DiagnosticsEngine &Diags) {
   FPU = 0;
+  MVE = 0;
   CRC = 0;
   Crypto = 0;
   DSP = 0;