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

Identified with misc-include-cleaner.

[clang][bytecode] Implement __noop (#106714)

This does nothing and returns 0.

[clang][bytecode][NFC] Cache the BuiltinID in Function (#106745)

FunctionDecl::getBuiltinID() is surprisingly slow and we tend to call it
quite a bit, especially when interpreting builtin functions

[clang][bytecode][NFC] Cache the BuiltinID in Function (#106745)

FunctionDecl::getBuiltinID() is surprisingly slow and we tend to call it
quite a bit, especially when interpreting builtin functions. Caching the
BuiltinID here reduces the time I need to compile the
floating_comparison namespace from builtin-functions.cpp from 7.2s to
6.3s locally.

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[clang][bytecode] Support ObjC blocks (#104551)

I started out by adding a new pointer type for blocks, and I was fully
prepared to compile their AST to bytecode and later call them.

... then I f

[clang][bytecode] Support ObjC blocks (#104551)

I started out by adding a new pointer type for blocks, and I was fully
prepared to compile their AST to bytecode and later call them.

... then I found out that the current interpreter doesn't support
calling blocks at all. So we reuse `Function` to support sources other
than `FunctionDecl`s and classify `BlockPointerType` as `PT_FnPtr`.

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

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