[AST] Migrate away from PointerUnion::dyn_cast (NFC) (#123283)

Note that PointerUnion::dyn_cast has been soft deprecated in
PointerUnion.h:

// FIXME: Replace the uses of is(), get() and dyn_cast(

[AST] Migrate away from PointerUnion::dyn_cast (NFC) (#123283)

Note that PointerUnion::dyn_cast has been soft deprecated in
PointerUnion.h:

// FIXME: Replace the uses of is(), get() and dyn_cast() with
// isa<T>, cast<T> and the llvm::dyn_cast<T>

Literal migration would result in dyn_cast_if_present (see the
definition of PointerUnion::dyn_cast), but this patch uses dyn_cast
because we expect Source to be nonnull.

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[AST] Remove unused includes (NFC) (#116549)

Identified with misc-include-cleaner.

[clang][bytecode] Fix source range of uncalled base dtor (#111683)

Make this emit the same source range as the current interpreter.

[clang][bytecode] Check for Pointer dereference in EvaluationResult (#108207)

We will deref<>() it later, so this is the right check.

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

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