[llvm] [profcheck] Change the FileCheck substitute command (PR #156985)

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``````````diff
--- lit.cfg.py	2025-09-04 23:41:48.000000 +0000
+++ lit.cfg.py	2025-09-04 23:52:55.453879 +0000
@@ -45,11 +45,11 @@
 # substitute FileCheck because llvm-reduce expects FileCheck in these tests.
 # It's not really possible to exclude these tests from the command substitution,
 # so we just exclude llvm-reduce tests from this config altogether. This should
 # be fine though as profcheck config tests are mostly concerned with opt.
 if config.enable_profcheck:
-  config.excludes = config.excludes + ["llvm-reduce"]
+    config.excludes = config.excludes + ["llvm-reduce"]
 
 # test_source_root: The root path where tests are located.
 config.test_source_root = os.path.dirname(__file__)
 
 # test_exec_root: The root path where tests should be run.

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https://github.com/llvm/llvm-project/pull/156985