Log Message:
llvm: updated to 9.0.0

9.0.0:
Non-comprehensive list of changes in this release:
* Two new extension points, namely EP_FullLinkTimeOptimizationEarly and \ 
EP_FullLinkTimeOptimizationLast are available for plugins to specialize the \ 
legacy pass manager full LTO pipeline.
* llvm-objcopy/llvm-strip got support for COFF object files/executables, \ 
supporting the most common copying/stripping options.
* The CMake parameter CLANG_ANALYZER_ENABLE_Z3_SOLVER has been replaced by \ 
LLVM_ENABLE_Z3_SOLVER.
* The RISCV target is no longer “experimental” (see Changes to the RISCV \ 
Target below for more details).
* The ORCv1 JIT API has been deprecated. Please see Transitioning from ORCv1 to \ 
ORCv2.
* Support for target-independent hardware loops in IR has been added, with \ 
PowerPC and Arm implementations.