New Intrinsics

[gingerBill]

New intrinsics to add to the compiler:

• expect :: proc(val, expected_val: T) -> T {...}
• trap :: proc() -> ! {...}
• debug_trap :: proc() -> ! {...}
• read_cycle_counter :: proc() -> i64 {...}
• frame_address :: proc(#const level: i32) -> rawptr {...}
• return_address :: proc(#const level: i32) -> rawptr {...}
• address_of_return_address :: proc() -> rawptr {...}
• stack_pointer_on_entry :: proc() -> rawptr {...}
• reverse_bits :: proc(x: T) -> T {...}
• byte_swap :: proc(x: T) -> T {...}
• count_ones :: proc(x: T) -> T {...}
• trailing_zeros :: proc(x: T) -> T {...}
• rotate_left :: proc(x: T, k: int) -> T {...}
• rotate_right :: proc(x: T, k: int) -> T {...}
• funnel_shift_left :: proc(x, y: T, k: uint) -> T {...}
• funnel_shift_right :: proc(x, y: T, k: uint) -> T {...}
• overflow_add :: proc(lhs, rhs: T) -> (T, bool) {...}
• overflow_sub :: proc(lhs, rhs: T) -> (T, bool) {...}
• overflow_mul :: proc(lhs, rhs: T) -> (T, bool) {...}
• bitfield_extract :: proc(value: T, offset, bits: uint) -> T {...}
• bitfield_insert :: proc(base, insert: T, offset, bits: uint) -> T {...}

[gingerBill]

 frame_address :: proc(#const level: i32) -> rawptr {...}
 return_address :: proc(#const level: i32) -> rawptr {...}
 address_of_return_address :: proc() -> rawptr {...}
 stack_pointer_on_entry :: proc() -> rawptr {...}

These are probably not needed because of inline assembly.

[gingerBill]

 rotate_left :: proc(x: T, k: int) -> T {...}
 rotate_right :: proc(x: T, k: int) -> T {...}
 funnel_shift_left :: proc(x, y: T, k: uint) -> T {...}
 funnel_shift_right :: proc(x, y: T, k: uint) -> T {...}

I see many benefits of rotate_* but is there any practical benefit of funnel_shift_* itself?

[gingerBill]

bitfield_extract :: proc(value: T, offset, bits: uint) -> T {...}
bitfield_insert :: proc(base, insert: T, offset, bits: uint) -> T {...}

Does these need to be an intrinsic or is something in the core library?