This fixes a few thing regarding code logging for profiling:

1) Append the execution tier, otherwise we get two function of the same
   name.
2) Replace "wasm-function[%d]" by "<wasm-unnamed>", since the index is
   appended later anyway.
3) Avoid unneeded JS heap and C++ heap allocations during logging.

R=jkummerow@chromium.org

Bug: chromium:1029470
Change-Id: Ie7af41f21e4595f8d8c574e4ad18273f89f1cb6e
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1943162
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#65285}