[clang] [llvm] [CMake][Release] Add option for enabling LTO to cache file (PR #77035)

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``````````bash
darker --check --diff -r 597086c60959dd5b3c032552e8b42dd1d053f233...df8296d418eac2b4db9d955a0aec25c4c1c22a9c clang/utils/perf-training/perf-helper.py
``````````

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View the diff from darker here.
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``````````diff
--- perf-helper.py	2024-01-08 17:26:31.000000 +0000
+++ perf-helper.py	2024-01-08 17:34:40.569938 +0000
@@ -35,12 +35,12 @@
             "Usage: %s clean <paths> <extension>\n" % __file__
             + "\tRemoves all files with extension from <path>."
         )
         return 1
     for path in args[1:-1]:
-       for filename in findFilesWithExtension(path, args[-1]):
-           os.remove(filename)
+        for filename in findFilesWithExtension(path, args[-1]):
+            os.remove(filename)
     return 0
 
 
 def merge(args):
     if len(args) < 3:
@@ -49,11 +49,11 @@
             + "\tMerges all profraw files from path into output."
         )
         return 1
     cmd = [args[0], "merge", "-o", args[1]]
     for i in range(2, len(args)):
-      cmd.extend(findFilesWithExtension(args[i], "profraw"))
+        cmd.extend(findFilesWithExtension(args[i], "profraw"))
     subprocess.check_call(cmd)
     return 0
 
 
 def merge_fdata(args):

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https://github.com/llvm/llvm-project/pull/77035