Backends support for debug_str merging

[Diana Chen]

Hi,

We're working on debug string table merging. Two new APIs in Relocator has been added to support it.

1. Relocator::getDebugStringOffset - get the offset of an input .debug_str according to given relocation.

2. Relocator::applyDebugStringOffset - apply the output .debug_str offset to relocation target according to given relocation and offset. 

These two APIs in ARM/AArch64/Mips/Mips64/X86/X86_64 have been done. Please check the branch debug-string.

https://code.google.com/p/mclinker/source/list?name=debug-string

Hi Simon,

Could you please help to review the Mips part? Thank you.

Hi Shankar and Hemant,

Could you please help to add the Hexagon part? Thank you.

Also please let me know if there is any suggestion or question.

Thanks,

Diana

[Simon Atanasyan]

Hi Diana,

The MIPS part and the patch in general look good to me. I have not
found any regressions.

Simon

[Pete Chou]

BTW, safe ICF is also target-specific, and is disabled on MIPS. You may want to take a look at that if you want to enable the opt.

Thanks,

Pete

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