[PATCH] Fix the return value of __builtin_eh_return_data_regno() for ARM and MIPS

[Logan Chien]

Hi,

  It seems that both ARMTargetInfo and MipsTargetInfoBase does not override
getEHDataRegisterNumber(), thus __builtin_eh_return_data_regno() will
always returns -1 on ARM and MIPS.  The patch should fix this issue, and
the test cases are included.  Please have a look.  Thanks.

Sincerely,
Logan
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