For some reason, the "ret" instruction goes missing on Mac release
builds, probably because the compiler decides to split the inline
assembly block and move the "v8_probe_memory_continuation" block
somewhere else. This CL fixes that by adding another explicit "ret" at
the end of "ProbeMemory".

Also, we remove the "v8_probe_memory_address" symbol (which is identical
to just "ProbeMemory"), to prevent the compiler from splitting
"ProbeMemory" and "v8_probe_memory_address".

R=ahaas@chromium.org

Bug: v8:11955
Change-Id: I2e63b2db94206e329be214ab7b553ab502d6ecc2
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3071202Reviewed-by: Andreas Haas <ahaas@chromium.org>
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#76091}