[vm] Test and fix resolving DWARF paths in obfuscated mode.
The DWARF generator would always attempt to deobfuscate the URL
retrieved from `Script` objects, whether it came from the `url`
or `resolved_url` field. However, the `resolved_url` field is not
obfuscated, and thus attempting to deobfuscate it could result in a different (and incorrect) string. Thus, only deobfuscate when not
resolving DWARF paths.
TEST=vm/dart{,_2}/use_resolve_dwarf_paths_flag
Bug: https://github.com/dart-lang/sdk/issues/44325
Change-Id: I57a3d47cc78035508082ccba23a2b1cd726ed6bb
Cq-Include-Trybots: luci.dart.try:vm-kernel-precomp-linux-release-x64-try
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/279086
Commit-Queue: Tess Strickland <sstrickl@google.com>
Reviewed-by: Daco Harkes <dacoharkes@google.com>
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