[wasm/tools] Add import profiler
Add a profiler for functions imported to WASM instances. This profiler is implemented entirely in JavaScript and monkey-patches WebAssembly.instantiate() and new WebAssembly.Instance() to instrument the imported functions to each instance in order to count their invocations and cumulative time. R=mstarzinger@chromium.org Bug: v8:8423 Change-Id: If456355aba07dc69c5500bafbe35fc56b31486af Reviewed-on: https://chromium-review.googlesource.com/c/1347488 Commit-Queue: Ben Titzer <titzer@chromium.org> Reviewed-by: Michael Starzinger <mstarzinger@chromium.org> Cr-Commit-Position: refs/heads/master@{#57746}
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