build-aux/org/whitehole/infra/types: Generate constants zero and one for
fixed-size integers.
org/whitehole/infra/types/StringAsciiz: Read from ByteArray8,
least-significant byte first.
build-aux/types: Generate converters to Int and Long for fixed-sized
integers.
assembly/ia32_x64: Default or force operand size to 64bit for
instructions requiring it.