Let .llvm_bb_addr_map section use the same unique id as its associated .text section.
Currently, llvm_bb_addr_map sections are generated per section names because we use
the LinkedToSymbol argument of getELFSection. This will cause the address map tables of functions
grouped into the same section when -function-sections=true -unique-section-names=false which is not
the intended behaviour. This patch lets the unique id of every .text section propagate to the associated
Reviewed By: MaskRay
Differential Revision: https://reviews.llvm.org/D92113