[BUILD] 工具链构建环境指导

> download code
`repo init -u https://gitee.com/liwentao_uiw/manifest.git -b add_llvm_toolchain-dev`

> mac x86-64
```
checkAtomic failed
solution: use llvm 12.0.0 instead

PythonAndSwig failed.
solution: brew install swig

nonexistpath libxml2.
solution: sudo cp -r /Library/Developer/CommandLineTools/SDKs/MacOSX12.3.sdk/usr/include/libxml2/ /Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/usr/include/

latomic not found
soulution: brew install gcc@8, find the lib dir of it (/usr/local/Cellar/gcc ...) and copy libatomic.dylib to prebuilts/host/darwin-x86/clang-10.0.1/lib

NSString.h no return: solution: 
download MacosSDK10.14 ver, and replace the NSString.h to the where you currently use.
```

> mac arm64 (m1/m2)
```
install Homebrew
brew install git-lfs java coreutils wget

softlink prebuilts/cmake/darwin-arm64/bin/cmake -> your local
softlink prebuilts/cmake/darwin-arm64/bin/ninja -> your local
```

> ubuntu x86-64
```
sudo apt-get install build-essential swig python3-dev libedit-dev libncurses5-dev binutils-dev

libclang_rt.fuzzer_no_main-x86_64.a in archive is not an object
solution:
softlink your /usr/bin/ld and /usr/bin/ld.lld with /usr/bin/ld.lld-10
lrwxrwxrwx 1 root root 18 Jun  6 14:53 /usr/bin/ld -> /usr/bin/ld.lld-10
ld --version
LLD 10.0.0 (compatible with GNU linkers)
```

OpenHarmony/third_party_llvm-project
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