add perf test for unwinding
This is to enable performance measurements of individual optimisations on stack tracing. To provide useful debugging information, Arm's Memory Tagging Extension (MTE) requires capturing stack traces on each allocation, therefore unwinding is a performance-sensitive operation. We're also planning to change Chrome's unwinders for MTE's complementary technologies (PAC and BTI). This test will help us measure the impact of these various flags and changes, check for regressions, and help us find optimizations. Bug: 1137393 Change-Id: I768c2dcf2cacdc5bba2cdec81d973b87ba3d4ea0 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2621832 Commit-Queue: Richard Townsend <richard.townsend@arm.com> Reviewed-by:Daniel Cheng <dcheng@chromium.org> Reviewed-by:
Kentaro Hara <haraken@chromium.org> Cr-Commit-Position: refs/heads/master@{#845185}
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