[llvm] [llvm-strings] Use small buffer instead of reading whole file (PR #163073)

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darker --check --diff -r origin/main...HEAD llvm/test/tools/llvm-strings/chunk-boundary.py
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``````````diff
--- chunk-boundary.py	2026-09-22 17:50:19.000000 +0000
+++ chunk-boundary.py	2026-09-22 17:53:59.490474 +0000
@@ -100,13 +100,11 @@
 )
 args = parser.parse_intermixed_args()
 
 repeat = args.repeat or [1] * len(args.parts)
 if len(repeat) != len(args.parts):
-    parser.error(
-        "--repeat has %d counts for %d PARTs" % (len(repeat), len(args.parts))
-    )
+    parser.error("--repeat has %d counts for %d PARTs" % (len(repeat), len(args.parts)))
 
 out = b"".join(
     (b"\0" * int(part) if part.isdigit() else part.encode()) * count
     for part, count in zip(args.parts, repeat)
 )

``````````

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https://github.com/llvm/llvm-project/pull/163073