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[patch 0/4] reimplement -fstrict-volatile-bitfields, v3

Here is my third attempt at cleaning up -fstrict-volatile-bitfields.

Part 1 removes the warnings and packedp flag. It is the same as in the last version, and has already been approved. I'll skip reposting it since the patch is here already:

Part 2 replaces parts 2, 3, and 4 in the last version. I've re-worked this code significantly to try to address Bernd Edlinger's comments on the last version in PR56997.

Part 3 is the test cases, which are the same as in the last version. Nobody has reviewed these but I assume they are OK if Part 2 is approved?

Part 4 is new; it makes -fstrict-volatile-bitfields not be the default for any target any more. It is independent of the other changes.

I've tested parts 1-3 together on arm-none-eabi, x86_64-linux-gnu (w/ full bootstrap), and mipsisa32r2-sde-elf (spot testing); results are the same as the last version I posted. Part 4 has only been tested on arm-none-eabi.

I hope this version is getting closer to something that might be acceptable. It's not perfect, but at least it cleans up a lot of ugly code and has fewer bugs than the status quo....


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