[CIR] Implemented get/set for volatile bitfields (#151875) This PR adds support for loading and storing volatile bit-field members according to the AAPCS specification. > A volatile bit-field must always be accessed using an access width appropriate to the type of its container, except when any of the following are true: > > * The bit-field container overlaps with a zero-length bit-field. > * The bit-field container overlaps with a non-bit-field member. For example, if a bit-field is declared as `int`, the load/store must use a 32-bit access, even if the field itself is only 3 bits wide.
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