MonoVM runtime size-reduction for WebAssembly

[SamMonoRT]

Native code reduction:

.NET 6 Preview 1

• [wasm] Add flag to remove non-blittable marshaling functionality from the runtime #43691 - [wasm] Add flag to remove non-blittable marshaling functionality from the runtime
• [wasm] Selectively strip the Name section of the wasm blob #43690 - [wasm] Selectively strip the Name section of the wasm blob
• [wasm] Enable relinking of the wasm binary at build time #43783 - [wasm] Enable relinking of the wasm binary at build time
• Remove assumption that Array has to implement all interfaces for MonoVM #44859 - Remove assumption that Array has to implement all interfaces for MonoVM

.NET 6 Preview 2

• Ensure ICU is fully linked out in invariant mode #43689 - [wasm] Ensure ICU is fully linked out in invariant mode
• Move System.Threading.Event/Mutex/Semaphore support to managed code #44795 - Move System.Threading.Event/Mutex/Semaphore support to managed code
• dotnet.timezones.blat file size has increased 34% since net5.0 #48061 - dotnet.timezones.blat file size has increased 34% since net5.0

.NET 6 Preview 3

• [mono] Remove w32 subsystem on wasm #48056 - [mono] Remove w32 subsystem on wasm
• [mono] Switch to shared implementation of LowLevelLock #48031 - [mono] Switch to shared implementation of LowLevelLock
• Remove dependency on USE_ZLIB from browser wasm build #45454 - Remove dependency on USE_ZLIB from browser wasm build
• [wasm] Experiment with emscripten settings to shrink binary size #43694 - [wasm] Experiment with emscripten settings to shrink binary size
• [wasm] Estimate ICU data size savings when only shipping English #48355 - [wasm] Estimate ICU data size savings when only shipping English

.NET 6 Preview 4

• Avoid bundling unnecessary functionality in the wasm published output #48225 - Avoid bundling unnecessary functionality in the wasm published output
• [wasm] Try to get sharding working for ICU #49220 - [wasm] Try to get sharding working for ICU
• [wasm] Investigate what parts of the data file map to what APIs #49221 - [wasm] Investigate what parts of the data file map to what APIs
• [wasm] Shrink data section in dotnet.wasm #49224 - [wasm] Shrink data section in dotnet.wasm

Future

• [wasm] Experiment with getting rid of SHA1Transform in the runtime #43693 - [wasm] Experiment with getting rid of SHA1Transform in the runtime
• Experiment with icu4x usage for wasm #47875 - Experiment with icu4x usage for wasm
• [mono] Remove framework-specific code and unnecessary MonoDomain usage #45034 - [mono] Remove framework-specific code and unnecessary MonoDomain usage
• Some .c and .h files are being published for non-blazorwasm apps #48016 - Some .c and .h files are being published for Blazor WASM apps
• [mono] Port managed Monitor implementation from NativeAOT #48058 - [mono] Port managed Monitor implementation from NativeAOT
• [wasm] Custom compression pass for wasm #49222 - [wasm] Custom compression pass for wasm
• Document wasm relinking functionality #48349 - Document wasm relinking functionality

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[sajjadarashhh]

a true way to solve this problem is using native-aot for wasm
we dont need dotnet.wasm when browsers is already have built-in runtimes

[SamMonoRT]

@lewing @steveisok - please can one of you take ownership of this.