[clang][x86][bytecode] remove trailing returns type from interp__builtin_elementwise_int_unaryop callbacks (#163905)

Regarding the discussion in #162346, this PR is to remove the trailing type from the 'interp__builtin_elementwise_int_unaryop' callbacks.

Author: donneypr

clang/lib/AST/ByteCode/InterpBuiltin.cpp

@@ -3285,14 +3285,14 @@ bool InterpretBuiltin(InterpState &S, CodePtr OpPC, const CallExpr *Call,
   case Builtin::BI__builtin_parityl:
   case Builtin::BI__builtin_parityll:
     return interp__builtin_elementwise_int_unaryop(
-        S, OpPC, Call, [](const APSInt &Val) -> APInt {
+        S, OpPC, Call, [](const APSInt &Val) {
           return APInt(Val.getBitWidth(), Val.popcount() % 2);
         });
   case Builtin::BI__builtin_clrsb:
   case Builtin::BI__builtin_clrsbl:
   case Builtin::BI__builtin_clrsbll:
     return interp__builtin_elementwise_int_unaryop(
-        S, OpPC, Call, [](const APSInt &Val) -> APInt {
+        S, OpPC, Call, [](const APSInt &Val) {
           return APInt(Val.getBitWidth(),
                        Val.getBitWidth() - Val.getSignificantBits());
         });
@@ -3301,8 +3301,7 @@ bool InterpretBuiltin(InterpState &S, CodePtr OpPC, const CallExpr *Call,
   case Builtin::BI__builtin_bitreverse32:
   case Builtin::BI__builtin_bitreverse64:
     return interp__builtin_elementwise_int_unaryop(
-        S, OpPC, Call,
-        [](const APSInt &Val) -> APInt { return Val.reverseBits(); });
+        S, OpPC, Call, [](const APSInt &Val) { return Val.reverseBits(); });
 
   case Builtin::BI__builtin_classify_type:
     return interp__builtin_classify_type(S, OpPC, Frame, Call);