[vm/compiler] Add flag for checking token positions. When this flag is enabled, then the validity of real token positions are checked in three places: * FlowGraphChecker::VisitInstruction * CodeSourceMapBuilder::BufferChangeLocation * DescriptorList::AddDescriptor The validity check ensures that, if the flow graph has an inlining ID, that the instruction has an inlining ID and that any real token position is a valid source offset for the appropriate script (found via the inlining ID) by attempting to look up line and column. This flag is disabled by default until existing issues with invalid inlining IDs and token positions are resolved. TEST=Enabled the flag manually to check that it caught invalid token positions. Bug: https://github.com/dart-lang/sdk/issues/44436 Cq-Include-Trybots: luci.dart.try:vm-kernel-precomp-linux-release-x64-try,vm-kernel-precomp-linux-product-x64-try Change-Id: I86439db3661d976ac4ea608d132e3277425615d5 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/175641 Reviewed-by: Martin Kustermann <kustermann@google.com>
Dart is:
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