[LTO] Turn ImportMapTy into a proper class (NFC) (#105748)
This patch turns type alias ImportMapTy into a proper class to provide
a more intuitive interface like:
ImportList.addDefinition(...)
as opposed to:
FunctionImporter::addDefinition(ImportList, ...)
Also, this patch requires all non-const accesses to go through
addDefinition, maybeAddDeclaration, and addGUID while providing const
accesses via:
const ImportMapTyImpl &getImportMap() const { return ImportMap; }
I realize ImportMapTy may not be the best name as a class (maybe OK as
a type alias). I am not renaming ImportMapTy in this patch at least
because there are 47 mentions of ImportMapTy under llvm/.
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