[Sampling profiler] Fix alloca unwind test

Inhibits compiler optimizations in release builds that were
causing the dynamic stack allocation with alloca to be optimized
out, resulting in the same execution as CallWithPlainFunction().
The disassembly for this implementation shows that the dynamic
allocation is now present.

Change-Id: Id8507c70aa89b132847b267b579661c532339f65
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1582320
Auto-Submit: Mike Wittman <wittman@chromium.org>
Commit-Queue: Charlie Andrews <charliea@chromium.org>
Reviewed-by: Charlie Andrews <charliea@chromium.org>
Cr-Commit-Position: refs/heads/master@{#653599}
1 file changed