[lld] [lld][ELF] Implement merged .debug_names section (PR #88092)

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``````````bash
darker --check --diff -r 9e485f48228114ab6c34151503740ea15cddb351...96466bc72cf851ecb1cb8d34b278294d5edf49f4 lld/test/ELF/tools/generate-debug-names.py
``````````

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View the diff from darker here.
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``````````diff
--- generate-debug-names.py	2024-04-16 22:54:46.000000 +0000
+++ generate-debug-names.py	2024-04-16 22:57:26.929891 +0000
@@ -1,32 +1,41 @@
 #!/usr/bin/env python
-'''Generate debug-names*.s test files with embedded C++ code in .ifdef GEN/.endif directives'''
+"""Generate debug-names*.s test files with embedded C++ code in .ifdef GEN/.endif directives"""
 import os, subprocess, sys
 
+
 def process(path):
-    ccfile = os.path.basename(path).replace('.s', '.cc').replace('debug-names-', '')
+    ccfile = os.path.basename(path).replace(".s", ".cc").replace("debug-names-", "")
     cc = []
     prolog = []
     is_cc = False
     is_prolog = True
     with open(path) as f:
         for line in f.readlines():
             line = line.rstrip()
-            if is_prolog: prolog.append(line)
-            if line.startswith('.endif'): is_cc = is_prolog = False
-            if is_cc: cc.append(line)
-            if line.startswith('.ifdef'): is_cc = True
+            if is_prolog:
+                prolog.append(line)
+            if line.startswith(".endif"):
+                is_cc = is_prolog = False
+            if is_cc:
+                cc.append(line)
+            if line.startswith(".ifdef"):
+                is_cc = True
 
     if not cc:
-        print('no .ifdef GEN, bail out', file=sys.stderr)
+        print("no .ifdef GEN, bail out", file=sys.stderr)
         return
-    sub = subprocess.run(f'clang -S -g -gpubnames -fno-ident -fdebug-compilation-dir=. -Xclang=-main-file-name -Xclang={ccfile} -xc++ - -o -'.split(),
-                         input='\n'.join(cc).encode(), capture_output=True)
+    sub = subprocess.run(
+        f"clang -S -g -gpubnames -fno-ident -fdebug-compilation-dir=. -Xclang=-main-file-name -Xclang={ccfile} -xc++ - -o -".split(),
+        input="\n".join(cc).encode(),
+        capture_output=True,
+    )
     if sub.returncode != 0:
-        print(f'failed\n{sub.stderr.decode()}', file=sys.stderr)
+        print(f"failed\n{sub.stderr.decode()}", file=sys.stderr)
         return
-    with open(path, 'w') as f:
-        print('\n'.join(prolog), file=f)
-        print(sub.stdout.decode(), file=f, end='')
+    with open(path, "w") as f:
+        print("\n".join(prolog), file=f)
+        print(sub.stdout.decode(), file=f, end="")
+
 
 for path in sys.argv[1:]:
     process(path)

``````````

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https://github.com/llvm/llvm-project/pull/88092