[SystemZ] Support vector registers with inline asm

Allow using vector register names and the "v" constraint
in inline asm to ensure compatibility with GCC.

llvm-svn: 322562
diff --git a/clang/lib/Basic/Targets/SystemZ.h b/clang/lib/Basic/Targets/SystemZ.h
index 3023c1d..91a41bc 100644
--- a/clang/lib/Basic/Targets/SystemZ.h
+++ b/clang/lib/Basic/Targets/SystemZ.h
@@ -62,6 +62,8 @@
     return None;
   }
 
+  ArrayRef<TargetInfo::AddlRegName> getGCCAddlRegNames() const override;
+
   bool validateAsmConstraint(const char *&Name,
                              TargetInfo::ConstraintInfo &info) const override;