Move device config file feature detection

Author: jzc

sycl/test-e2e/lit.cfg.py

@@ -658,6 +658,17 @@ def open_check_file(file_name):
     # Use short names for LIT rules.
     config.available_features.add("any-device-is-" + be)
 
+if config.llvm_main_include_dir:
+    lit_config.note("Using device config file built from LLVM")
+    config.available_features.add("device-config-file")
+    config.substitutions.append(
+        ("%device_config_file_include_flag", f"-I {config.llvm_main_include_dir}")
+    )
+elif os.path.exists(f"{config.sycl_include}/llvm/SYCLLowerIR/DeviceConfigFile.hpp"):
+    lit_config.note("Using installed device config file")
+    config.available_features.add("device-config-file")
+    config.substitutions.append(("%device_config_file_include_flag", ""))
+
 # That has to be executed last so that all device-independent features have been
 # discovered already.
 config.sycl_dev_features = {}
@@ -828,15 +839,6 @@ def open_check_file(file_name):
         ("%clang", " " + config.dpcpp_compiler + " " + config.c_flags)
     )
 
-if config.llvm_main_include_dir:
-    config.available_features.add("device-config-file")
-    config.substitutions.append(
-        ("%device_config_file_include_flag", f"-I {config.llvm_main_include_dir}")
-    )
-elif os.path.exists(f"{config.sycl_include}/llvm/SYCLLowerIR/DeviceConfigFile.hpp"):
-    config.available_features.add("device-config-file")
-    config.substitutions.append(("%device_config_file_include_flag", ""))
-
 # Set timeout for a single test
 try:
     import psutil