PR 11924: Fix mips check for internally-generated symbols

[Eric Christopher]

> Tested on mips-sgi-irix6.5, mips-sgi-irix6.5o32, mips64-linux-gnu
> and mipsisa64-elf.  cgd verified that it fixed the PR without
> showing testsuite regressions.  OK to install?
> 

OK.

> Richard
> 
> 
> 	PR target/11924
> 	* config/mips/mips.c (INTERNAL_SYMBOL_P): New macro.
> 	(mips_classify_symbol, m16_usym8_4, m16_usym5_4): Use it.

-- 
Eric Christopher <echristo@redhat.com>