CoreCLR Interpreter - preventing executable code generation at runtime

[janvorli]

Currently, CoreCLR generates some executable code at runtime besides the JITted code. This work stream will provide alternative approaches for platforms that don't allow runtime executable code generation.

M1

• Alternative to VSD dispatch stubs - PR: Cached interface dispatch for coreclr #111771

M2

• Alternative to the UMEntryThunk - PR: Move UMEntryThunk to StubPrecode infrastructure #112460
• Alternative to the ThisPtrRetBufPrecode PR: Add ThisptrRetbufPrecode to set of precodes handled by StubPrecode path #112548

M3

• Alternative to the way fixup and stub precodes and call counting stubs are generated.
• Alternative GC write barrier

M4

• Alternative to the DynamicHelpers used by the R2R code PR: Stub Precode variant for DynamicHelpers #113402

M5

• Alternative to ShuffleThunks + Non-IL based Unboxing stubs
• Modify debugger code to work properly with all the changes made to prevent executable code generation at runtime.

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