Log Message:
llvm: updated to 8.0.0

8.0.0:
Non-comprehensive list of changes in this release
* The llvm-cov tool can now export lcov trace files using the -format=lcov \ 
option of the export command.
* The add_llvm_loadable_module CMake macro has been removed. The \ 
add_llvm_library macro with the MODULE argument now provides the same \ 
functionality. See Writing an LLVM Pass.
* For MinGW, references to data variables that might need to be imported from a \ 
dll are accessed via a stub, to allow the linker to convert it to a dllimport if \ 
needed.
* Added support for labels as offsets in .reloc directive.
* Support for precise identification of X86 instructions with memory operands, \ 
by using debug information. This supports profile-driven cache prefetching. It \ 
is enabled with the -x86-discriminate-memops LLVM Flag.
* Support for profile-driven software cache prefetching on X86. This is part of \ 
a larger system, consisting of: an offline cache prefetches recommender, AutoFDO \ 
tooling, and LLVM. In this system, a binary compiled with \ 
-x86-discriminate-memops is run under the observation of the recommender. The \ 
recommender identifies certain memory access instructions by their binary file \ 
address, and recommends a prefetch of a specific type (NTA, T0, etc) be \ 
performed at a specified fixed offset from such an instruction’s memory \ 
operand. Next, this information needs to be converted to the AutoFDO syntax and \ 
the resulting profile may be passed back to the compiler with the LLVM flag \ 
-prefetch-hints-file, together with the exact same set of compilation parameters \ 
used for the original binary. More information is available in the RFC.
* Windows support for libFuzzer (x86_64).