[llvm-dev] Introduce release tag into compiler-rt repo

[hukeping via llvm-dev]

Hi there,

Do we have any plan to add release tags  to the compiler-rt git repo, say  http://llvm.org/git/compiler-rt ?
Without a release tag I’m not sure which version of compiler-rt  the llvm-project is using.

Take “LLVM 10.0.0 Release”( https://github.com/llvm/llvm-project/releases/tag/llvmorg-10.0.0)  as an example:
The tarball of compiler-rt been used in this version is “compiler-rt-10.0.0.src.tar.xz”,  is there anyway to figure out where does this tarball come from , and which was the corresponding COMMIT in the compiler-rt’s git repo?

Another example:
It seems we use different compiler-rt between  LLVM 9.0.1 Release and LLVM 9.0.1-rc1 Release,
```
# md5sum and tarball name

15f234da3e9a7f2a50173c1c95a6436e  compiler-rt-9.0.1rc1.src.tar.xz
1b39b9b90007a2170ebe77d6214ec581  compiler-rt-9.0.1.src.tar.xz
```
Does these tarball all from branch release_90(there are also branch release_80, release_70, etc)?   If so,  which commit was picked by the different llvm release?


Thanks,
Hu Keping
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