Fix path separator check on windows

Author: arsenm

clang/test/Driver/hip-temps-linux.hip

@@ -2,16 +2,16 @@
 // REQUIRES: amdgpu-registered-target
 
 // Check no temporary files or directores are left after compilation.
-// RUN: rm -rf %t/mytmp
-// RUN: mkdir -p %t/mytmp
+// RUN: rm -rf %t%{fs-sep}mytmp
+// RUN: mkdir -p %t%{fs-sep}mytmp
 // RUN: env TMPDIR="%t/mytmp" %clang --target=x86_64-linux-gnu -nogpulib -nogpuinc \
 // RUN:   --rocm-path=%S/Inputs/rocm -nostdinc -nostdlib -c \
 // RUN:   --offload-arch=gfx1030 -emit-llvm -v %s 2>&1 | \
-// RUN:   FileCheck -check-prefixes=CHECK %s
+// RUN:   FileCheck -DTMPDIR=%t%{fs-sep}mytmp%{fs-sep} %s
 // RUN: ls %t/mytmp >%t/mytmp.txt 2>&1
 // RUN: touch %t/empty.txt
 // RUN: diff %t/mytmp.txt %t/empty.txt
 
-// CHECK: -o {{.*}}/mytmp/hip-temps-linux-gfx1030-{{.*}}.bc
+// CHECK: -o {{.*}}[[TMPDIR]]hip-temps-linux-gfx1030-{{.*}}.bc
 
 int main() {}