Identified with misc-include-cleaner.

Use a forward-declaration instead.

Prepare for new pass manager version of `MachineDominatorTreeAnalysis`.
We may need a machine dominator tree version of `DomTreeUpdater` to
handle `SplitCriticalEdge` in some CodeGen passes.

Move WebAssemblyUtilities from Utils to the CodeGen library. It
primarily deals in MIR layer types, so it really lives in the CodeGen
library.

Move a variety of other things around to try create better separation.

See issue #64166 for more info on layering.

Move llvm/include/CodeGen/WasmAddressSpaces.h back to
llvm/lib/Target/WebAssembly/Utils.

Differential Revision: https://reviews.llvm.org/D156472

Without explicitly checking and erroring out, an invalid personality
function, which is not `__gxx_wasm_personality_v0`, caused
a segmentation fault down the line because `WasmEHFuncInfo` was not
created. This explicitly checks the validity of personality functions in
functions with EH pads and errors out explicitly with a helpful error
message. This also adds some more assertions to ensure `WasmEHFuncInfo`
is correctly created and non-null.

Invalid personality functions wouldn't be generated by our Clang, but
can be present in handwritten ll files, and more often, in files
transformed by passes like `metarenamer`, which is often used with
`bugpoint` to simplify names in `bugpoint`-reduced files.

Reviewed By: dschuff

Differential Revision: https://reviews.llvm.org/D152203

This is a (fixed) recommit of https://reviews.llvm.org/D121169

after:  1061034926
before: 1063332844

Discourse thread: https://discourse.llvm.org/t/include-what-you-use-include-cleanup
Differential Revision: https://reviews.llvm.org/D121681

This reverts commit 7f230feeeac8a67b335f52bd2e900a05c6098f20.
Breaks CodeGenCUDA/link-device-bitcode.cu in check-clang,
and many LLVM tests, see comments on https://reviews.llvm.org/D121169

after:  1061034926
before: 1063332844

Differential Revision: https://reviews.llvm.org/D121169