[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/combine-comparisons-by-cse.ll b/llvm/test/CodeGen/AArch64/combine-comparisons-by-cse.ll
index 1f8e0ef..86be3cc 100644
--- a/llvm/test/CodeGen/AArch64/combine-comparisons-by-cse.ll
+++ b/llvm/test/CodeGen/AArch64/combine-comparisons-by-cse.ll
@@ -1,4 +1,4 @@
-; RUN: llc < %s -march=aarch64 -mtriple=aarch64-linux-gnu | FileCheck %s
+; RUN: llc < %s -mtriple=aarch64-linux-gnu | FileCheck %s
 
 ; marked as external to prevent possible optimizations
 @a = external global i32