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This patch enables context sensitive PGO (CSPGO) for LTO on AIX. Two parts are involved: # Frontend logic is added so libLTO can understand the CSPGO related options. # Two options are added to the backend so that the LTOCodeGenerator can understand the CSPGO related options and make use of them. Reviewed By: MaskRay Differential Revision: https://reviews.llvm.org/D138854