[PATCH] D136392: [bazel] Generate `//:vars.bzl` from `llvm/CMakeLists.txt`

[NAKAMURA Takumi via Phabricator via llvm-commits]

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`_extract_cmake_settings()` generates `vars.bzl` in `llvm_configure()`.
It would be easier to use external commands like sed(1) and python.
For portability, the parser should run on Starlark.

`//:vars.bzl` may be loaded from both WORKSPACE and BUILD.

At the moment, `vars.bzl` provides some values as string.

- CMAKE_CXX_STANDARD = "17"
- LLVM_VERSION_MAJOR = "16"
- LLVM_VERSION_MINOR = "0"
- LLVM_VERSION_PATCH = "0"
- LLVM_VERSION = "16.0.0"
- llvm_vars = (dict of these values)

`CMAKE_CXX_STANDARD` may be used to configure toolchain.

[bazel] Migrate LLVM_VERSION stuff to llvm_config_defines

It would be smarter if the BUILD phase could generate `llvm-config.h`.
Since I am afraid of the discussion in D126581 <https://reviews.llvm.org/D126581>, I just remove
LLVM_VERSION stuff out of the static `llvm-config.h`.

[bazel] Define LLD_VERSION_STRING with vars.bzl.

[bazel] Define CLANG_VERSION stuff with vars.bzl


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D136392

Files:
  utils/bazel/configure.bzl
  utils/bazel/llvm-project-overlay/clang/BUILD.bazel
  utils/bazel/llvm-project-overlay/clang/include/clang/Config/config.h
  utils/bazel/llvm-project-overlay/lld/BUILD.bazel
  utils/bazel/llvm-project-overlay/llvm/config.bzl
  utils/bazel/llvm-project-overlay/llvm/include/llvm/Config/llvm-config.h

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