This constructor implicitly calls `Open` (when `masm` is not `NULL`) to initialise the scope, so it is ready to use immediately after it has been cons

Emit the instruction in buffer_.

A code buffer can emit: 8, 16, 32 or 64-bit data: constant. 16 or 32-bit data: instruction. string: debug info.

Emit a fixup at the current location.

Included to make the class concrete, however should never be called.

Copy a string into the instruction stream, including the terminating NULL character. The instruction pointer is then aligned correctly for subsequent