Amir Ayupov cd7a630585 [BOLT][DOCS] Build doxygen documentation
Summary:
Added doxygen configuration files and CMake directives, copy-pasta from flang.

```cmake -G Ninja ../llvm-project/llvm \
  -DLLVM_ENABLE_PROJECTS="bolt" \
  -DBOLT_INCLUDE_DOCS=YES \
  -DLLVM_ENABLE_DOXYGEN=YES
ninja doxygen-bolt
```

(cherry picked from FBD33303249)
2021-12-23 15:23:39 -08:00
Description
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5.5 GiB
Languages
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C++ 31.7%
C 13%
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