[vm/compiler] Early work on IL deserializer.
At this point, we do get some successful deserializations (of
methods that are optimized into constant value returns).
Adds support for:
GraphEntry (including constant pool)
FunctionEntry
TargetEntry
Return
Results from compiling hello world program:
* Early round trip
* Contains unhandled instructions: 4180
* Failed during deserialization: 0
* Successful round trip: 0
* Late round trip
* Contains unhandled instructions: 4163
* Failed during deserialization : 0
* Successful round trip: 15
Bug: https://github.com/dart-lang/sdk/issues/36882
Change-Id: I9e0919f6ffbfe059ce0efd55f9a767c1ba805795
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/113325
Commit-Queue: Teagan Strickland <sstrickl@google.com>
Reviewed-by: Martin Kustermann <kustermann@google.com>
Reviewed-by: Aart Bik <ajcbik@google.com>
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