[turbofan] Remove deprecated --turbo-from-bytecode flag.

src/ast/ast-numbering.cc

Index: src/ast/ast-numbering.cc
diff --git a/src/ast/ast-numbering.cc b/src/ast/ast-numbering.cc
index e0069f81ac8d8137070379f7a525f2515d04da8a..158df6eb74553b240567192a23aa6a01570c2b92 100644
--- a/src/ast/ast-numbering.cc
+++ b/src/ast/ast-numbering.cc
@@ -592,12 +592,7 @@ bool AstNumberingVisitor::Renumber(FunctionLiteral* node) {
   }
 
   if (IsGeneratorFunction(node->kind()) || IsAsyncFunction(node->kind())) {
-    // Generators can be optimized if --turbo-from-bytecode is set.
-    if (FLAG_turbo_from_bytecode) {
-      DisableCrankshaft(kGenerator);
-    } else {
-      DisableOptimization(kGenerator);
-    }
+    DisableCrankshaft(kGenerator);
   }
 
   if (IsClassConstructor(node->kind())) {