recursive inlines in stl_tree

[Phil Edwards]

The stl_tree.cc bit has a nonpublic function called __black_count which is 
declared inline.  However, it calls itself.  I fully understand why and what 
it's doing.  What confuses me is why this is declared to be inline.  I can 
only think of a couple possible reasons, and none of them seem to make sense.

I came across this using egcs1.1 and asking for both -finline-functions and 
-Winline (as well as a boatload of other warning opts), and __black_count was 
the only one it said it could not inline.  This is also true of the 2.90.2 
release.

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