[PATCH][ARM] Skip excluded sections when inserting mapping symbols for data-only sections

[Christophe Lyon]

Hi,

On ARM, mapping symbols are inserted at the beginning of data-only sections, but in the case of merged sections it can result in a nameless symbol (when the corresponding input section has SEC_EXCLUDE). This causes Android's apriori to raise an assertion.

I propose the attached fix, tested on arm-none-eabi.

OK to commit?

Thanks

Christophe.
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