[libc][bazel] Use Bazel aspects to implement libc_release_library. (#134948)

Instead of creating hundreds of implicit "filegroup" targets to keep
track of sources and textual headers required to build each libc
function or helper library, use Bazel aspects (see
https://bazel.build/versions/8.0.0/extending/aspects), which enable
transparent collection of transitive sources / textual headers while
walking the dependency DAG, and minimizes the Starlark overhead.

Co-authored-by: Jordan Rupprecht <rupprecht@google.com>
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  11. libc/
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  34. CODE_OF_CONDUCT.md
  35. CONTRIBUTING.md
  36. LICENSE.TXT
  37. pyproject.toml
  38. README.md
  39. SECURITY.md
README.md

The LLVM Compiler Infrastructure

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Welcome to the LLVM project!

This repository contains the source code for LLVM, a toolkit for the construction of highly optimized compilers, optimizers, and run-time environments.

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