PATCH] Fix PR 31531: A microoptimization of isnegative of signed integer

[Hurugalawadi, Naveen]

Hi Richard,

>> What's the motivation of splitting this into a equal type 
>> and a non-equal type case?  Simply only allow nop-conversions here
>> (tree_nop_conversion_p) and unconditionally emit

Done.

Thanks for the review and Comments. Implemented the modifications
as per you review comments.
Please review the modified patch and let me know if its okay?

Thanks,
Naveen
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