[llvm] [clang] [Clang][CMake] Add CSSPGO support to LLVM_BUILD_INSTRUMENTED (PR #79942)

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``````````bash
darker --check --diff -r c34aa784f8867517315d8ef32a8038ee9dbb7165...90686f2cd5e210f9ca974c10f8c1224a825c1315 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	2024-01-30 04:13:23.000000 +0000
+++ perf-helper.py	2024-01-30 04:20:47.870019 +0000
@@ -42,11 +42,11 @@
 
 
 def merge(args):
     parser = argparse.ArgumentParser(
         prog="perf-helper merge",
-        description="Merges all profraw files from path into output"
+        description="Merges all profraw files from path into output",
     )
     parser.add_argument("profdata", help="Path to llvm-profdata tool")
     parser.add_argument("output", help="Output filename")
     parser.add_argument("path", help="Folder containing input profraw files")
     parser.add_argument("--sample", action="store_true", help="Sample profile")
@@ -74,21 +74,18 @@
 
 
 def perf(args):
     parser = argparse.ArgumentParser(
         prog="perf-helper perf",
-        description="perf wrapper for BOLT/CSSPGO profile collection"
+        description="perf wrapper for BOLT/CSSPGO profile collection",
     )
     parser.add_argument(
         "--lbr", action="store_true", help="Use perf with branch stacks"
     )
-    parser.add_argument(
-        "--call-graph", action="store_true", help="Collect call graph"
-    )
-    parser.add_argument(
-        "--event", help="PMU event name, defaults to cycles:u",
-        default="cycles:u"
+    parser.add_argument("--call-graph", action="store_true", help="Collect call graph")
+    parser.add_argument(
+        "--event", help="PMU event name, defaults to cycles:u", default="cycles:u"
     )
     parser.add_argument("cmd", nargs=argparse.REMAINDER, help="")
 
     opts = parser.parse_args(args)
     cmd = opts.cmd[1:]
@@ -139,22 +136,23 @@
     return 0
 
 
 def perf2prof(args):
     parser = argparse.ArgumentParser(
-            prog="perf-helper perf2prof",
-            description="perf to CSSPGO prof conversion wrapper",
-            )
+        prog="perf-helper perf2prof",
+        description="perf to CSSPGO prof conversion wrapper",
+    )
     parser.add_argument("profgen", help="Path to llvm-profgen binary")
     parser.add_argument("binary", help="Input binary")
     parser.add_argument("path", help="Path containing perf.data files")
     opts = parser.parse_args(args)
 
     profgen_args = [opts.profgen, f"--binary={opts.binary}"]
     for filename in findFilesWithExtension(opts.path, "perf.data"):
-        subprocess.check_call(profgen_args + [f"--perfdata={filename}",
-                                              f"--output={filename}.profraw"])
+        subprocess.check_call(
+            profgen_args + [f"--perfdata={filename}", f"--output={filename}.profraw"]
+        )
     return 0
 
 
 def dtrace(args):
     parser = argparse.ArgumentParser(

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https://github.com/llvm/llvm-project/pull/79942