[WebAssembly] Remove unused includes (NFC) (#116318)

Identified with misc-include-cleaner.

[IR] Don't include Module.h in Analysis.h (NFC) (#97023)

Replace it with a forward declaration instead. Analysis.h is pulled in
by all passes, but not all passes need to access the module.

[WebAssembly] Create separation between MC and CodeGen layers

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

[WebAssembly] Create separation between MC and CodeGen layers

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

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[WebAssembly] Refactor and fix emission of external IR global decls

Reland of 00bf4755.

This patches fixes the visibility and linkage information of symbols
referring to IR globals.

Emission of ex

[WebAssembly] Refactor and fix emission of external IR global decls

Reland of 00bf4755.

This patches fixes the visibility and linkage information of symbols
referring to IR globals.

Emission of external declarations is now done in the first execution
of emitConstantPool rather than in emitLinkage (and a few other
places). This is the point where we have already gathered information
about used symbols (by running the MC Lower PrePass) and not yet
started emitting any functions so that any declarations that need to
be emitted are done so at the top of the file before any functions.

This changes the order of a few directives in the final asm file which
required an update to a few tests.

Reviewed By: sbc100

Differential Revision: https://reviews.llvm.org/D118995

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Revert "[WebAssembly] Refactor and fix emission of external IR global decls"

This reverts commit 00bf4755e90c89963a135739218ef49c2417109f.

This change broke the emscripten builder (among other thin

Revert "[WebAssembly] Refactor and fix emission of external IR global decls"

This reverts commit 00bf4755e90c89963a135739218ef49c2417109f.

This change broke the emscripten builder (among other things):

https://ci.chromium.org/ui/p/emscripten-releases/builders/try/linux/b8823500584349280721/overview

Sample failure:

```
test_unistd_unlink (test_core.core0) ...
wasm-ld: error: symbol type mismatch: __stdio_write
>>> defined as WASM_SYMBOL_TYPE_FUNCTION in /usr/local/google/home/sbc/dev/wasm/emscripten/cache/sysroot/lib/wasm32-emscripten/libc-debug.a(__stdio_write.o)
>>> defined as WASM_SYMBOL_TYPE_DATA in /usr/local/google/home/sbc/dev/wasm/emscripten/cache/sysroot/lib/wasm32-emscripten/libc-debug.a(stderr.o)
```

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[WebAssembly] Refactor and fix emission of external IR global decls

This patches fixes the visibility and linkage information of symbols
referring to IR globals.

Emission of external declarations i

[WebAssembly] Refactor and fix emission of external IR global decls

This patches fixes the visibility and linkage information of symbols
referring to IR globals.

Emission of external declarations is now done in the first execution
of emitConstantPool rather than in emitLinkage (and a few other
places). This is the point where we have already gathered information
about used symbols (by running the MC Lower PrePass) and not yet
started emitting any functions so that any declarations that need to
be emitted are done so at the top of the file before any functions.

This changes the order of a few directives in the final asm file which
required an update to a few tests.

Reviewed By: sbc100

Differential Revision: https://reviews.llvm.org/D118122

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[WebAssembly] Change WebAssemblyMCLowerPrePass to ModulePass

It was a FunctionPass before, which subverted its purpose to collect ALL symbols before MCLowering, depending on how LLVM schedules funct

[WebAssembly] Change WebAssemblyMCLowerPrePass to ModulePass

It was a FunctionPass before, which subverted its purpose to collect ALL symbols before MCLowering, depending on how LLVM schedules function passes.
Fixes https://bugs.llvm.org/show_bug.cgi?id=51555

Differential Revision: https://reviews.llvm.org/D109202

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[WebAssembly] Added initial type checker to MC Assembler

This to protect against non-sensical instruction sequences being assembled,
which would either cause asserts/crashes further down, or a Wasm

[WebAssembly] Added initial type checker to MC Assembler

This to protect against non-sensical instruction sequences being assembled,
which would either cause asserts/crashes further down, or a Wasm module being output that doesn't validate.

Unlike a validator, this type checker is able to give type-errors as part of the parsing process, which makes the assembler much friendlier to be used by humans writing manual input.

Because the MC system is single pass (instructions aren't even stored in MC format, they are directly output) the type checker has to be single pass as well, which means that from now on .globaltype and .functype decls must come before their use. An extra pass is added to Codegen to collect information for this purpose, since AsmPrinter is normally single pass / streaming as well, and would otherwise generate this information on the fly.

A `-no-type-check` flag was added to llvm-mc (and any other tools that take asm input) that surpresses type errors, as a quick escape hatch for tests that were not intended to be type correct.

This is a first version of the type checker that ignores control flow, i.e. it checks that types are correct along the linear path, but not the branch path. This will still catch most errors. Branch checking could be added in the future.

Differential Revision: https://reviews.llvm.org/D104945

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