Change initial_gas to be of type u64 .

[noaov1]

This change is 

[elintul]

Reviewed 13 of 13 files at r1, all commit messages.
Reviewable status: all files reviewed, 2 unresolved discussions (waiting on @giladchase and @noaov1)

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crates/blockifier/src/execution/entry_point.rs line 57 at r1 (raw file):

    pub caller_address: ContractAddress,
    pub call_type: CallType,
    pub initial_gas: u64,

Consider adding a short comment about the fact the it should suffice.

Code quote:

pub initial_gas: u64,

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crates/blockifier/src/execution/deprecated_syscalls/mod.rs line 293 at r1 (raw file):

    )?;

    let initial_gas = constants::INITIAL_GAS_COST;

I think we can lose this variable now, throughout the code.

Code quote:

let initial_gas = constants::INITIAL_GAS_COST;

[elintul]

Reviewed 6 of 6 files at r2, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @giladchase)