[vm/bytecode] Store generated bytecodes more efficiently, add inline pragmas

Change-Id: Iae69f28e8ff66be60a1780182b247d870575c891
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/122180
Commit-Queue: Alexander Markov <alexmarkov@google.com>
Reviewed-by: Ryan Macnak <rmacnak@google.com>

Author: alexmarkov