[clang][bytecode] Support bitcasting into float fields (#114825)

[clang][bytecode] Implement bitcasts to composite types (#114776)

Only fixed-size, non-bitfield integral fields for now.

[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] Create dummy pointers for non-reference DeclRefExprs (#113202)

... with non-constant initializers.

[clang][bytecode] Diagnose invalid declrefs differently if we've... (#113140)

... tried their initializer already. In that case, diagnose the
non-const initializer instead of the reference to a non

[clang][bytecode] Diagnose invalid declrefs differently if we've... (#113140)

... tried their initializer already. In that case, diagnose the
non-const initializer instead of the reference to a non-constexpr
variable later. This is used in a lot of openmp tests.

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[clang][bytecode] Narrow pointer in UO_Deref unary operators (#113089)

Otherwise we treat this like an array element even though we should
treat it as a single object.

[clang][bytecode] Check for memory leaks after destroying global scope (#112868)

The global scope we create when evaluating expressions might free some
of the dynamic memory allocations, so we can'

[clang][bytecode] Check for memory leaks after destroying global scope (#112868)

The global scope we create when evaluating expressions might free some
of the dynamic memory allocations, so we can't check for memory leaks
before destroying it.

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[clang][bytecode] Ignore explicit calls to trivial dtors (#112841)

This is what the current interpreter does as well.

[clang][bytecode] Fix __builtin_convertvector with float-cast (#112238)

Comparing their PrimTypes isn't enough in this case. We can have a
floating cast here as well.

[clang][bytecode] Fix discarding block expressions (#112185)

[clang][bytecode] Use PredefinedExpr as base for its variable (#111956)

This fixes the error message generated.

[clang][bytecode] Return an lvalue path for dummy pointers (#111862)

Not doing this is wrong in general and we need to reject expressions
where it would matter differently.

[clang][bytecode] Fix temporary lvalue base expression (#111808)

We need to use the MaterializeTemporaryExpr here so the checks in
ExprConstant.cpp do the right thing.

[clang][bytecode] Diagnose class-specific operator delete calls (#111700)

[clang][bytecode] Emit better diagnostic for invalid shufflevector index (#111643)

[clang][bytecode] Handle UETT_OpenMPRequiredSimdAlign (#111259)

[clang][bytecode] Handle DiscardResult for fixed-point literals (#110475)

[clang][bytecode] Cast fixed-point cmp result to int if necessary (#110469)

This is the case in C.

[clang][bytecode] Implement fixed-point shifts (#110429)

[clang][bytecode] Implement more binary operators for fixed point types (#110423)

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

And some cleanups around overflow handling.

[clang][bytcode] Convert Fixed Point values to target semantics... (#110411)

... after a binary operation. The Result of the operation is in the
common semantics of RHS and LHS, so we need to conve

[clang][bytcode] Convert Fixed Point values to target semantics... (#110411)

... after a binary operation. The Result of the operation is in the
common semantics of RHS and LHS, so we need to convert that to the
semantics of the BinaryOperator expression.

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[clang][bytecode] Implement fixed point casts (#110409)

[clang][bytecode] Implement fixed-point add (#110405)

[clang][bytecode] Implement fixed-point-to-float casts (#110369)