X86: Support dollar symbol for AT&T syntax and add output-asm-variant to llc '$' indicates immediate values in AT&T syntax, so symbol names starting with '$' need to be quoted or wrapped in parentheses. Parentheses are preferred to support expressions with relocation specifiers without modifying MCExpr internals, aligning with GCC (https://gcc.gnu.org/PR91298). Add `-output-asm-variant` to llc for testing Intel syntax, avoiding `-x86-asm-syntax` which affects MCAsmInfo used by input assembly (-x86-asm-syntax=intel doesn't work with AT&T module asm) Note: In these positions the symbol name cannot be quoted: `$var:` `.globl $var` `.type $var, @object` Close #147587 Pull Request: https://github.com/llvm/llvm-project/pull/147876
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