[clang] [clang][x86][bytecode] added trailing type for ffs, missed in pr llvm#162346 for llvm#160288 (PR #163905)

[Simon Pilgrim via cfe-commits]

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@@ -3173,7 +3173,7 @@ bool InterpretBuiltin(InterpState &S, CodePtr OpPC, const CallExpr *Call,
   case Builtin::BI__builtin_ffsl:
   case Builtin::BI__builtin_ffsll:
     return interp__builtin_elementwise_int_unaryop(
-        S, OpPC, Call, [](const APSInt &Val) {
+        S, OpPC, Call, [](const APSInt &Val) -> APInt {
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RKSimon wrote:

I thought the plan was to remove all of these things? 

https://github.com/llvm/llvm-project/pull/163905