intel/compiler tests: fix path-to-string conversion

cc: mesa-stable

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/34756>

src/intel/compiler/elk/tests/run-test.py

@@ -46,7 +46,7 @@ for asm_file in args.gen_folder.glob('*.asm'):
         command = elk_asm + [
             '--type', 'hex',
             '--gen', args.gen_name,
-            asm_file
+            asm_file.as_posix()
         ]
         stdout = subprocess.check_output(command, timeout=1).decode()
         lines_after = stdout.splitlines(keepends=True)

src/intel/compiler/tests/run-test.py

@@ -46,7 +46,7 @@ for asm_file in args.gen_folder.glob('*.asm'):
         command = brw_asm + [
             '--type', 'hex',
             '--gen', args.gen_name,
-            asm_file
+            asm_file.as_posix()
         ]
         stdout = subprocess.check_output(command, timeout=1).decode()
         lines_after = stdout.splitlines(keepends=True)