[patch] Don't compute a "patched" storage class

[Rafael Espíndola]

For variables and functions clang stores two storage classes. The one
"as written" in the code and a patched one, which, for example,
propagates static to the following decls.

This apparently is from the days clang lacked linkage computation. It
is now redundant and this patch removes it.

Cheers,
Rafael
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