io.c: reduce IO.copy_stream stack usage on Linux

nogvl_copy_file_range and nogvl_copy_stream_sendfile each
used 344 bytes of stack before this change.  Now, they are
inlined into nogvl_copy_stream_func which only uses 200 bytes
of stack.

"struct stat" is 144 bytes on my 64-bit Linux.

Note: this doesn't affect GC (yet) since GVL is released;
but increases safety if called from deep machine stacks.

It will affect GC if Thread::Light is merged.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@66053 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

0 files changed, 0 insertions, 0 deletions