Add a "xcheri-std-compat" mode to LLVM#756

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arichardson wants to merge 18 commits intoCTSRD-CHERI:devfrom

arichardson:std-compat

Commits on Feb 20, 2025

[CHERI StdCompat] Add a flag to disable non-standard instructions
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[CHERI StdCompat] Expand CGetOffset
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[CHERI StdCompat] Expand CGetSealed
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[CHERI StdCompat] Expand CSetOffset to a CSetAddr sequence
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[CHERI StdCompat] Expand (CClearTag x) to (CSetHigh x, (CGetHigh x))
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[CHERI StdCompat] Expand CRRL to the equivalent CRAM sequence
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[CHERI StdCompat] Emit a Clang error for unsupported builtins
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[CHERI StdCompat] Disable more unsupported intrinsics
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[CHERI StdCompat] Add a baseline test for a broken pre-defined macro
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[CHERI StdCompat] Correctly define a __riscv_xcheri_std_compat macro
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[CHERI StdCompat] Add MC support for the modesw.{cap,int} instructions
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[CHERI StdCompat] Expand explicit mode loads using mode-switching
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[CHERI StdCompat] Expand explicit mode stores using mode-switching
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