[clang] [clang] Better bitfield access units (PR #65742)

efriedma-quic wrote: The primary issue with over-wide bitfield accesses is ensuring we don't cause data races. C++ [intro.memory]p3: "A memory location is either an object of scalar type that is not a bit-field or a maximal sequence of adjacent bit-fields all having nonzero width. Two or

[clang] [clang] Better bitfield access units (PR #65742)

nunoplopes wrote: Note that changing the memory accesses performed by clang (load or store) *is* an ABI change at IR level because of UB. Also, please have a look at the existing `-ffine-grained-bitfield-accesses` flag and the discussions around it and IPO.

[clang] [clang] Better bitfield access units (PR #65742)

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[clang] [clang] Better bitfield access units (PR #65742)

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