[X86] Fix inline asm modifier printing across dialects (#204558) X86AsmPrinter handles several inline asm operand modifiers differently depending on whether the asm block uses AT&T or Intel syntax. For `%a` and `%A`, the scalar/register operand path used AT&T punctuation unconditionally. In Intel-dialect inline asm this could print invalid forms such as `(rdi)` for an address operand or `*rdi` for an indirect call operand. For `%P`, `PrintAsmMemoryOperand` passed `"disp-only"` to both the Intel and AT&T memory printers, but only the Intel path honored it for global/symbol displacements with a base register. The AT&T path could therefore print `g(%rdi)` even though `%P` requested displacement-only output. Make the affected X86 asm-printer paths dialect-aware/consistent: - print Intel `%a` register operands as `[reg]` - print Intel `%A` register operands without AT&T `*` - make AT&T `%P` honor `"disp-only"` for global/symbol displacements, matching the existing Intel behavior Found via @jlebar's X86 LLVM bug-hunt / FuzzX effort. cc @jlebar Co-authored-by: Ayush Rai <your-email@amd.com>
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