Fix MSVC build#394

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202603_msvc_fixes

Commits on Mar 14, 2026

HIR ConstEval - Add `size_of_val` implementation
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Commits on Mar 15, 2026

HIR StaticBorrowConstants - Run const-eval after adding items (avoids evaluation order issues)
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Commits on Mar 21, 2026

MIR Cleanup - Allow `*mut T` from `&T` for constants
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Commits on Mar 22, 2026

All - Glue to pass external library/linking kinds through to codegen
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Codegen C - Handle "raw-dylib" link kinds (windows only)
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