f95daf6168
This supersedes https://dart-review.googlesource.com/c/sdk/+/4614. Patch 1 is the unmodified source_map_stack_trace.dart. Patch 2 is my fixes for DDC. Change-Id: I30c6fad4bdc75061edbacc5fc75482af98e29bbb Reviewed-on: https://dart-review.googlesource.com/4960 Reviewed-by: Jacob Richman <jacobr@google.com> Reviewed-by: Jake Macdonald <jakemac@google.com> Commit-Queue: Vijay Menon <vsm@google.com>