For all i386 string assembly functions that don't overlap use END() so
that symbol size information is available.

branches: 1.1.2; 1.1.8;
Add support for size optimised versions of the assembler functions in
the small subdirectory. Provide more compact versions of the functions
used by bootxx in x86.

Rebase to HEAD as of a few days ago.

sync with head.

for a reference, the tree before this commit was tagged
as yamt-pagecache-tag8.

this commit was splitted into small chunks to avoid
a limitation of cvs. ("Protocol error: too many arguments")