disable sbrk and emulate EVM linear memory internally #76
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Signed-off-by: Cyrill Leutwiler <bigcyrill@hotmail.com>
Signed-off-by: xermicus <cyrill@parity.io>
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This PR gets rid of calling the PVM sbrk functionality because it was disabled in the pallet. Instead we emulate the EVM linear memory heap internally with a static memory buffer.
I also changed the memory tests to run differentially; I found no reason why we our linear memory implementation needs to differ in intentional ways.
Max mem size is initially set conservatively to 64kb.