Commits on Mar 21, 2021

1. Download a more recent LLVM version if src/version is modified …

   When bumping the bootstrap version, the name of the generated LLVM
   shared object file is changed, even though it's the same contents as
   before. If bootstrap tries to use an older version, it will get linking
   errors:
   
   ```
   Building rustdoc for stage1 (x86_64-unknown-linux-gnu)
      Compiling rustdoc-tool v0.0.0 (/home/joshua/rustc/src/tools/rustdoc)
   error: linking with `cc` failed: exit code: 1
     |
     = note: "cc" "-Wl,--as-needed" ... lots of args ...
     = note: /usr/bin/ld: cannot find -lLLVM-12-rust-1.53.0-nightly
             clang: error: linker command failed with exit code 1 (use -v to see invocation)
   
   error: could not compile `rustdoc-tool`
   ```

   

   jyn514 committed Mar 21, 2021
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