[PATCH] Correct re-applying relocations on MIPS platforms

[Petar Jovanovic]

Hello everyone,

here is a patch that corrects how multiple relocations are applied on MIPS.

Similar to ARM change r182800, dynamic linker will reads bits/addends from
the original object rather than from the object that might have been patched
previously. For the purpose of relocations for MCJIT stubs on MIPS, we
internally use otherwise unused MIPS relocations.

The change also enables MCJIT unit tests for MIPS (EL/BE), and the following
two tests now pass:

- MCJITTest.return_global and
- MCJITTest.multiple_functions.

Regards,
Petar
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