start vim 8.0.550 with "LANG=tr_TR.UTF-8" (tested on Linux). Type "iI" on a 
line and do gu/gU

Expected behavior:
with casemap=keepascii,internal (default) it should behave like C or English 
locale
with casemap= it should use the Turkish dotted uppercase and dotless lowercase 
variants

Actual behavior:
Neither works, in both cases i and I are left completely unchanged. The issue 
seems to be that vim_tolower always uses single-byte locale-dependent 
implementation for c < 0x80, disregarding the fact that a single-byte char 
might become multi-byte in the locale (and also ignoring casemap=keepascii, 
which I guess is unintended). On the other hand f_tolower and f_toupper works 
correctly as they call utf_tolower directly which implements the correct 
behavior respecting casemap.

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