Yuta Saito 915c4a6997 [LTO] Support LLVM level link time optimization ...

This commit adds -lto flag for driver to enable LTO at LLVM level.
When -lto=llvm given, compiler emits LLVM bitcode file instead of object
file and perform thin LTO using libLTO.dylib plugin.
When -lto=llvm-full given, perform full LTO instead of thin LTO.

2020-05-31 08:12:52 +09:00

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