[record_use] Const instances loading units Before this CL, we were only recording constants once, in the first loading unit that they were found. Now, we record them in all loading units. The different backends have different behavior, so for now this CL special cases some of the test expectations. It would be better to write these tests in a different way: For example reading the json file and seeing that we find at least two different loading units. Also, the implementation uses the fact that we're not using source information anymore. We should consider simply removing it from the dart2js backend. Bug: https://github.com/dart-lang/native/issues/3184 TEST=pkg/compiler/test/record_use/record_use_test.dart TEST=pkg/dart2wasm/test/record_use_test.dart TEST=pkg/vm/test/transformations/record_use_test.dart Change-Id: If4c474d5bb65b58181d76904f5c7c1e7147c79ac Cq-Include-Trybots: luci.dart.try:dart2wasm-asserts-linux-chrome-try,dart2wasm-asserts-minified-linux-d8-try,dart2wasm-linux-chrome-try,dart2wasm-linux-d8-try,dart2wasm-linux-firefox-try,dart2wasm-linux-jscm-chrome-try,dart2wasm-linux-optimized-jsc-try,pkg-linux-debug-try,pkg-linux-release-arm64-try,pkg-linux-release-try,pkg-mac-release-arm64-try,pkg-mac-release-try,pkg-win-release-arm64-try,pkg-win-release-try,dart2js-canary-linux-try,dart2js-hostasserts-linux-d8-try,dart2js-linux-chrome-try,dart2js-linux-firefox-try,dart2js-mac-chrome-try,dart2js-mac-safari-try,dart2js-minified-csp-linux-chrome-try,dart2js-minified-linux-d8-try,dart2js-unit-linux-x64-release-try,dart2js-win-chrome-try Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/485860 Commit-Queue: Daco Harkes <dacoharkes@google.com> Reviewed-by: Sigmund Cherem <sigmund@google.com>
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