RULE-6-1: Permit bitfields of other integer types, depending on the compiler

Support for the use of bitfields on integer types outside of unsigned int and signed int depends on the implementation.

gcc - permits any integer type to be use for bitfields, per https://gcc.gnu.org/onlinedocs/gcc/Structures-unions-enumerations-and-bit-fields-implementation.html.
armclang - "Enumeration types, long and long long (signed and unsigned) are allowed as bitfield types." https://developer.arm.com/documentation/100067/0612/Standard-C-Implementation-Definition/Structures--unions--enumerations--and-bitfields
clang - I believe it supports at least long and long long, but I cannot find canonical documentation for that. It is alluded to elsewhere, though, e.g. https://www.open-std.org/jtc1/sc22/wg14/www/docs/n2774.htm.
qcc - no information, would need some research

Based on https://godbolt.org/z/Yfha6Gfhd we can assume compatibility between Gcc and Clang for the versions we support.

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