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Because indirect call tables use static addresses for call sites, but pc values recorded by runtime may be subject to ASLR in PIE, we couldn't find indirect call descriptions by their runtime address in PIE. It resulted in [unknown] entries in profile for all indirect calls. We need to substract base address of .text from runtime addresses to get the corresponding static addresses. Here we create a getter for base address of .text and substract it's return value from recorded PC values. It converts them to static addresses, which then may be used to find the corresponding indirect call descriptions. Reviewed By: rafauler Differential Revision: https://reviews.llvm.org/D154121