Reapply "[clang][bytecode] Handle bitcasts involving bitfields (#116843)"

This reverts commit 54db16221c92eb52efbea90ad5b5d2a1d00cda3e.

Check for existence of __SIZOEF_INT128__ so we don't run thos

Reapply "[clang][bytecode] Handle bitcasts involving bitfields (#116843)"

This reverts commit 54db16221c92eb52efbea90ad5b5d2a1d00cda3e.

Check for existence of __SIZOEF_INT128__ so we don't run those
tests on targets that don't have int128.

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Revert "[clang][bytecode] Handle bitcasts involving bitfields (#116843)"

This reverts commit 4b5e7fa4de54e00df007ae5e2675393fd046aa59.

This breaks builders:
https://lab.llvm.org/buildbot/#/builders

Revert "[clang][bytecode] Handle bitcasts involving bitfields (#116843)"

This reverts commit 4b5e7fa4de54e00df007ae5e2675393fd046aa59.

This breaks builders:
https://lab.llvm.org/buildbot/#/builders/154/builds/8464

I guess some more testing on 32 bit hosts is needed.

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[clang][bytecode] Handle bitcasts involving bitfields (#116843)

Copy the data one bit at a time, leaving optimizations for future work.
Adds a BitcastBuffer that takes care of pushing the bits in th

[clang][bytecode] Handle bitcasts involving bitfields (#116843)

Copy the data one bit at a time, leaving optimizations for future work.
Adds a BitcastBuffer that takes care of pushing the bits in the right
order.

show more ...

[clang][bytecode] Start implementing __builtin_bit_cast (#112126)

This is a subset of #68288, with hopefully narrower scope. It does not
support bitcasting to non-integral types yet.
Bitfields are

[clang][bytecode] Start implementing __builtin_bit_cast (#112126)

This is a subset of #68288, with hopefully narrower scope. It does not
support bitcasting to non-integral types yet.
Bitfields are supported, but only if they result in a full byte-sized
final buffer. It does not support casting from null-pointers yet or
casting from indeterminate bits.


The tests are from #68288 and partially from #74775.

The `BitcastBuffer` struct is currently always working in single bits,
but I plan to (try to) optimize this for the common full-byte case.

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[clang][bytecode] Implement fixed-point-to-int casts (#110417)

And some cleanups around overflow handling.

[clang][bytecode] Only booleans can be inverted

No need to have the Inv() function be templated.

[clang] Rename all AST/Interp stuff to AST/ByteCode (#104552)

"Interp" clashes with the clang interpreter and people often confuse
this.