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[ELF] Allow multiple thunks to be added for a symbol.

Description

[ELF] Allow multiple thunks to be added for a symbol.

This change permits there to be more than one thunk to be associated with
a symbol. For interworking thunks we only require one thunk, but range
extension thunks may require more than one.

Differential Revision: https://reviews.llvm.org/D34037