[PATCH, trivial] Make type_hash_lookup, type_hash_add static

[Maxim Kuvyrkov]

This patch makes type_hash_lookup and type_hash_add in tree.c static.  These 
functions are used only within tree.c, and I don't think there is any reason to 
export low-level interface to type hashing anyway.

Will commit in 2 days unless someone complains.  Bootstrapped on 
x86_64-linux-gnu.

Thanks,

--
Maxim Kuvyrkov
KugelWorks

gcc-static-type-hash.ChangeLog
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gcc-static-type-hash.patch
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