[liftoff] Inline PopToRegister and outline SpillOneRegister
{PopToRegister} will most likely find that the stack slot is already holding a register (89% of cases on epic). Thus put the fast path for this in the header, so it can be inlined. Also, {GetUnusedRegister} will mostly find an unused register (95% on epic). Hence, make sure that the code for spilling a register is not inlined. Drive-by: Avoid the call to {LoadToRegister} if we already checked before if the slot is holding a register. R=thibaudm@chromium.org Bug: v8:10576 Change-Id: I13797fa5c12c5359f2578a4dbebb63aa50c00e60 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2237144 Commit-Queue: Clemens Backes <clemensb@chromium.org> Reviewed-by:Thibaud Michaud <thibaudm@chromium.org> Cr-Commit-Position: refs/heads/master@{#68280}
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