MANAGER_LAMBDA.transferToContract: simplify generated lambda.

[sagotch]

MANAGER_LAMBDA.transferToContract produces instruction list which includes:

[{ prim: 'IF_NONE', args:[[[{ prim: 'UNIT' }, { prim: 'FAILWITH' }]] , [] ]}]

which is equivalent to

{ prim: 'IF_NONE', args:[[{ prim: 'UNIT' }, { prim: 'FAILWITH' }] , [] ]}

Old lambda generated

{ DROP ;
  NIL operation ;
  PUSH address "KT1FqCVKxbof2wRPxfLSRnMJfKH39Zh912AK" ;
  CONTRACT unit ;
  { IF_NONE { { UNIT ; FAILWITH } } {} } ;
  PUSH mutez 1 ;
  UNIT ;
  TRANSFER_TOKENS ;
  CONS }

Baker fee 0.000583 ꜩ
Storage fee 0.04575 ꜩ
Gas used 1,735 / 1,835 [94.6%]
Storage used 183 / 183 [100%]

• https://better-call.dev/mumbainet/opg/onw7aPpCUuHjpSynEGcZPywQCML9iepU89VNaZeKS8jrWhhAdWi
• https://mumbainet.tzkt.io/onw7aPpCUuHjpSynEGcZPywQCML9iepU89VNaZeKS8jrWhhAdWi/35951

New lambda generated

{ DROP ;
  NIL operation ;
  PUSH address "KT1FqCVKxbof2wRPxfLSRnMJfKH39Zh912AK" ;
  CONTRACT unit ;
  IF_NONE { UNIT ; FAILWITH } {} ;
  PUSH mutez 666000 ;
  UNIT ;
  TRANSFER_TOKENS ;
  CONS }

Baker fee 0.000575 ꜩ
Storage fee 0.04375 ꜩ
Gas used 1,732 / 1,832 [94.5%]
Storage used 175 / 175 [100%]

• https://better-call.dev/mumbainet/opg/oouMiYyyv31YicBnE5B2UsLV42XiF9UMdHMJzQ5ZVBh6VnoM5jo
• https://mumbainet.tzkt.io/oouMiYyyv31YicBnE5B2UsLV42XiF9UMdHMJzQ5ZVBh6VnoM5jo/35952

Once executed, the manually crafted lambda transfer tez as expected

• https://mumbainet.tzkt.io/onktCUehbtEMBff7bAJqm7s8sJfWUFx3ecCvh4wbPaAsyRitpC8/35953

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[dsawali]

Thanks for your contribution @sagotch. This should be a pretty useful update.

I will take a final look around next week. If everything looks good, we'll merge it then.

[dsawali]

Hello @sagotch, the PR looks good but could you rebase with current master. Thank you!