[ddc] Update ddb to run with ddc/legacy modules in d8 - Fixes broken benchmarks in ddc because the benchmarks run in d8 with the ddc module system can handle conflicting library names more gracefully than es6. - In the future we need to update the source of truth for dart_library.js so we can keep the file in sync. - Removes the ability for ddb to run with any precompiled sdk.js from a dart installation. Now you must run a build first and the sdk.js files from that build will be used. This means the `--debug` flag no longer changes which sdk.js files are used. Change-Id: Icaf78956f93ff643d23e68001354ec08c9c28b12 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/166926 Reviewed-by: Mark Zhou <markzipan@google.com> Commit-Queue: Nicholas Shahan <nshahan@google.com>
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