[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/arm64-fmax.ll b/llvm/test/CodeGen/AArch64/arm64-fmax.ll
index 40cc36e..8337d29 100644
--- a/llvm/test/CodeGen/AArch64/arm64-fmax.ll
+++ b/llvm/test/CodeGen/AArch64/arm64-fmax.ll
@@ -1,4 +1,4 @@
-; RUN: llc -march=arm64 -enable-no-nans-fp-math < %s | FileCheck %s
+; RUN: llc < %s -mtriple=arm64-eabi -enable-no-nans-fp-math | FileCheck %s
 
 define double @test_direct(float %in) {
 ; CHECK-LABEL: test_direct: