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x86: ia32_setup_sigcontext(): lift user_access_{begin,end}() into the callers
What's left is just a sequence of stores to userland addresses, with all
error handling, etc. done out of line. Calling that from user_access block
is safe, but rather than teaching objtool to recognize it as such we can
just make it always_inline - it is small enough and has few enough callers,
for the space savings not to be an issue.
Rename the sucker to __unsafe_setup_sigcontext32() and provide
unsafe_put_sigcontext32() with usual kind of semantics.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>