[MLIR] Remove unused lit test replacements.

[csigg]

Summary

The following replacements have been changed to %mlir_lib_dir:

• %linalg_test_lib_dir
• %cuda_wrapper_library_dir
• %spirv_wrapper_library_dir
• %vulkan_wrapper_library_dir
• %mlir_runner_utils_dir
• %mlir_integration_test_dir

If there are no requests to delay submission, I plan to submit this on 9/13/2002 (Tuesday).

See also PSA: https://discourse.llvm.org/t/psa-removing-mlir-lit-test-replacements/65124

[csigg]

Rebase.

mlir/test/lit.cfg.py

 tools.extend([
     ToolSubst('toy-ch1', unresolved='ignore'),
     ToolSubst('toy-ch2', unresolved='ignore'),
     ToolSubst('toy-ch3', unresolved='ignore'),
     ToolSubst('toy-ch4', unresolved='ignore'),
     ToolSubst('toy-ch5', unresolved='ignore'),
     ToolSubst('%mlir_lib_dir', config.mlir_lib_dir, unresolved='ignore'),
     ToolSubst('%mlir_src_dir', config.mlir_src_root, unresolved='ignore'),
-    # The substitutions below will be replaced by '%mlir_lib_dir' shortly.
-    ToolSubst('%linalg_test_lib_dir', config.mlir_lib_dir, unresolved='ignore'),
-    ToolSubst('%mlir_runner_utils_dir', config.mlir_lib_dir, unresolved='ignore'),
-    ToolSubst('%spirv_wrapper_library_dir', config.mlir_lib_dir, unresolved='ignore'),
-    ToolSubst('%vulkan_wrapper_library_dir', config.mlir_lib_dir, unresolved='ignore'),
-    ToolSubst('%mlir_integration_test_dir', config.mlir_lib_dir, unresolved='ignore'),
 ])
 
 python_executable = config.python_executable
 # Python configuration with sanitizer requires some magic preloading. This will only work on clang/linux.
 # TODO: detect Darwin/Windows situation (or mark these tests as unsupported on these platforms).
 if "asan" in config.available_features and "Linux" in config.host_os:
   python_executable = f"LD_PRELOAD=$({config.host_cxx} -print-file-name=libclang_rt.asan-{config.host_arch}.so) {config.python_executable}"
 # On Windows the path to python could contains spaces in which case it needs to be provided in quotes.