perf: return onERC1155Received selector without shifting

[wjmelements]

Reviewer @Maddiaa0
CC @kadenzipfel

Changes

• don't shift
• msize

[wjmelements]

I also want to try msize instead of 0x20

[wjmelements]

55b0d66

revert that commit if CI fails

[wjmelements]

msize uses less codesize and execution gas than push1

[Philogy]

I'd add the small note that unlike the original version this makes assumptions about surrounding memory (that 0x20..0x3c is zeroed)

[wjmelements]

I'd add the small note that unlike the original version this makes assumptions about surrounding memory (that 0x20..0x3c is zeroed)

252a35b

[wjmelements]

I have attached erc1155.tar.gz, which demonstrates (using a dio config) that if both approaches are allowed to use MSIZE, this approach is still 2 less execution gas and 2 less codesize.