[BUG] compiler fails to report a violation of rule 10.6.1.f regarding software-writable fields spanning multiple sub-words

[nachumg]

• [ x] I have reviewed this project's contribution guidelines

Describe the bug
The following code should fail compilation but does not.

addrmap top {
  reg {
    regwidth = 64;
    accesswidth = 32;
    field {sw=rw;} f1[64] = 0;
  } r1;
};

The SystemRDL 2.0 spec says at 10.6.1.f :

"Any field that is software-writable or clear on read shall not span multiple software accessible sub-words (e.g., a 64-bit register with a 32-bit access width may not have a writable field with bits in both the upper and lower half of the register)."

Expected behavior
Compilation failure with helpful error message.