[llvm] [AArch64] Fix crash parsing an operand with both :specifier: and `@specifier` (PR #219737)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- llvm/lib/Target/AArch64/AsmParser/AArch64AsmParser.cpp --diff_from_common_commit
``````````

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``````````diff
diff --git a/llvm/lib/Target/AArch64/AsmParser/AArch64AsmParser.cpp b/llvm/lib/Target/AArch64/AsmParser/AArch64AsmParser.cpp
index 65b9ab98c..ac17783e4 100644
--- a/llvm/lib/Target/AArch64/AsmParser/AArch64AsmParser.cpp
+++ b/llvm/lib/Target/AArch64/AsmParser/AArch64AsmParser.cpp
@@ -4480,7 +4480,8 @@ bool AArch64AsmParser::parseSymbolicImmVal(const MCExpr *&ImmVal) {
     ImmVal = MCSpecifierExpr::create(ImmVal, RefKind, getContext(), Loc);
 
   SMLoc EndLoc;
-  // :specifier: and @specifier are alternative syntaxes; nesting them is invalid.
+  // :specifier: and @specifier are alternative syntaxes; nesting them is
+  // invalid.
   if (!HasELFModifier && getContext().getAsmInfo().hasSubsectionsViaSymbols()) {
     if (getParser().parseAtSpecifier(ImmVal, EndLoc))
       return true;

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https://github.com/llvm/llvm-project/pull/219737