[AARCH64] Enable AARCH64 lit tests on windows dev machines

As discussed on PR27654, this patch fixes the triples of a lot of aarch64 tests and enables lit tests on windows

This will hopefully help stop cases where windows developers break the aarch64 target

Differential Revision: https://reviews.llvm.org/D22191

llvm-svn: 275973
diff --git a/llvm/test/CodeGen/AArch64/large_shift.ll b/llvm/test/CodeGen/AArch64/large_shift.ll
index f72c97d..e0ba501 100644
--- a/llvm/test/CodeGen/AArch64/large_shift.ll
+++ b/llvm/test/CodeGen/AArch64/large_shift.ll
@@ -1,5 +1,4 @@
-; RUN: llc -march=aarch64 -o - %s
-target triple = "arm64-unknown-unknown"
+; RUN: llc -mtriple=arm64-unknown-unknown -o - %s
 
 ; Make sure we don't run into an assert in the aarch64 code selection when
 ; DAGCombining fails.