Patch for constant %hi()s on MIPS

[Eric Christopher]

> Patch fixes the attached test case and causes no regressions
> on mips-elf or mips64-elf.  OK to install?
> 
> Richard
> 
> 
> [gas/]
> 	* config/tc-mips.c (mips_ip): Don't work out the value of
> 	constant %hi()s here.
> 
> [gas/testsuite/]
> 	* gas/mips/elf-consthilo.[sd]: New test.
> 	* gas/mips/mips.exp: Run it.
> 

OK.

-eric

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