[AsmPrinter] Add generic support for verifying instruction sizes (#187703) Many backends rely on TII reporting correct instruction sizes for MIR level branch relaxation passes. Reporting a too small size can result in MC fixup failures (or silent miscompiles for unvalidated fixups). Some time ago I added validation to the PPC asm printer to verify that the TII instruction size matches the actually emitted size. This was very helpful to systematically fix all incorrectly reported instruction sizes. However, the same problem also exists in lots of other backends, so this moves the validation into AsmPrinter, controlled by a new getInstSizeVerifyMode() hook in TII, which is disabled by default. The intention here is to gradually enable this validation for more backends (which requires fixing them first).
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