Accounts incur a copy when passed to invoke that may not be neccissary

[jackcmay]

Problem

When passing accounts to invoke the runtime copies the data out of the program space, calls the inner instruction processor, and then copies the data back. Now that programs exit on any error these copy operations are probably not necessary:

Specifically:

solana/programs/bpf_loader/src/syscalls.rs

Line 1010 in df8cafe

data: data.to_vec(),

solana/programs/bpf_loader/src/syscalls.rs

Line 1620 in df8cafe

for (i, (account, account_ref)) in accounts.iter().zip(account_refs).enumerate() {

Context: #14523

Proposed Solution

Remove this copy and just use the buffer directly.

Doing so s complicated by the fact that the buffer might be realloc via SystemProgram::CreateAccount or more generally later and there could be a conflict between the runtime and in-program allocator.

[jackcmay]

Account copies reduced via:

#15813
#15799