Use "a" instead of "a0" in DataLayout.

It means exactly the same and is just a bit shorter.

llvm-svn: 197169
diff --git a/llvm/lib/Target/SystemZ/SystemZTargetMachine.cpp b/llvm/lib/Target/SystemZ/SystemZTargetMachine.cpp
index dee92e9..87c09b5 100644
--- a/llvm/lib/Target/SystemZ/SystemZTargetMachine.cpp
+++ b/llvm/lib/Target/SystemZ/SystemZTargetMachine.cpp
@@ -31,7 +31,7 @@
     // so that we can refer to it using LARL.  We don't have any special
     // requirements for stack variables though.
     DL("E-p:64:64:64-i1:8:16-i8:8:16-i16:16-i32:32-i64:64"
-       "-f32:32-f64:64-f128:64-a0:8:16-n32:64"),
+       "-f32:32-f64:64-f128:64-a:8:16-n32:64"),
     InstrInfo(*this), TLInfo(*this), TSInfo(*this),
     FrameLowering(*this, Subtarget) {
   initAsmInfo();