[llvm] [lit] Prevent "lld" from being substituted by LIT in llvm-driver tests (PR #191893)

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``````````diff
--- config.py	2026-04-13 21:33:47.000000 +0000
+++ config.py	2026-04-13 21:49:52.029842 +0000
@@ -826,11 +826,17 @@
         )
         self.config.substitutions.append(
             (" %clang-cl ", '''\"*** invalid substitution, use '%clang_cl'. ***\"''')
         )
 
-    def use_lld(self, additional_tool_dirs=[], required=True, use_installed=False, no_substitutions=()):
+    def use_lld(
+        self,
+        additional_tool_dirs=[],
+        required=True,
+        use_installed=False,
+        no_substitutions=(),
+    ):
         """Configure the test suite to be able to invoke lld.
 
         Sets up some environment variables important to lld, locates a
         just-built or optionally an installed lld, and add a set of standard
         substitutions useful to any test suite that makes use of lld.

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https://github.com/llvm/llvm-project/pull/191893