This is a standalone patch and this would help Propeller do a better job of code layout as it can accurately attribute the profiles to the right internal linkage function.
This also helps SampledFDO/AutoFDO correctly associate sampled profiles to the right internal function. Currently, if there is more than one internal symbol foo, their profiles are aggregated by SampledFDO.
This patch adds a new clang option, -funique-internal-funcnames, to generate unique names for functions with internal linkage. This patch appends the md5 hash of the module name to the function symbol as a best effort to generate a unique name for symbols with internal linkage.