[vm/isolates] Introduce sendAndExit.
sendAndExit allows for fast data passing from worker isolate back to
parent.
```
| linux x64 | spawnIsolate | sendAndExit |
|us per iter | over sync | over send |
+------------+--------------+-------------+
IsolateJson.Decode50KBx1(RunTime): 43,175.000 339.83%
IsolateJson.SendAndExit_Decode50KBx1(RunTime): 22,070.000 124.83% -48.88%
IsolateJson.SyncDecode50KBx1(RunTime): 9,816.284
IsolateJson.Decode50KBx4(RunTime): 77,630.000 104.56%
IsolateJson.SendAndExit_Decode50KBx4(RunTime): 46,307.000 22.02% -40.35%
IsolateJson.SyncDecode50KBx4(RunTime): 37,949.528
IsolateJson.Decode100KBx1(RunTime): 71,035.000 270.42%
IsolateJson.SendAndExit_Decode100KBx1(RunTime): 43,056.000 124.52% -39.39%
IsolateJson.SyncDecode100KBx1(RunTime): 19,176.733
IsolateJson.Decode100KBx4(RunTime): 120,915.000 54.66%
IsolateJson.SendAndExit_Decode100KBx4(RunTime): 67,101.000 -14.17% -44.51%
IsolateJson.SyncDecode100KBx4(RunTime): 78,179.731
IsolateJson.Decode250KBx1(RunTime): 173,574.000 202.52%
IsolateJson.SendAndExit_Decode250KBx1(RunTime): 103,334.000 80.10% -40.47%
IsolateJson.SyncDecode250KBx1(RunTime): 57,375.314
IsolateJson.Decode250KBx4(RunTime): 292,118.000 20.30%
IsolateJson.SendAndExit_Decode250KBx4(RunTime): 168,444.000 -30.63% -42.34%
IsolateJson.SyncDecode250KBx4(RunTime): 242,831.000
IsolateJson.Decode1MBx1(RunTime): 631,578.000 166.34%
IsolateJson.SendAndExit_Decode1MBx1(RunTime): 371,127.000 56.50% -41.24%
IsolateJson.SyncDecode1MBx1(RunTime): 237,135.778
IsolateJson.Decode1MBx4(RunTime): 1,322,789.000 36.16%
IsolateJson.SendAndExit_Decode1MBx4(RunTime): 657,179.000 -32.35% -50.32%
IsolateJson.SyncDecode1MBx4(RunTime): 971,473.333
```
Bug: https://github.com/dart-lang/sdk/issues/37835
Bug: https://github.com/dart-lang/sdk/issues/36097
Change-Id: I386641e1431ed9f2e34fac36f562607a666ee4a8
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/142823
Commit-Queue: Alexander Aprelev <aam@google.com>
Reviewed-by: Martin Kustermann <kustermann@google.com>
Reviewed-by: Ryan Macnak <rmacnak@google.com>
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