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

[James Henderson via llvm-commits]

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+## Show that a file that cannot be opened is reported on stderr, and that
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jh7370 wrote:

Let's be specific - "cannot be opened, e.g, because it does not exist, is reported..."

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