Remove uses of Dart VM bytecode mode from Flutter engine (flutter#21741)

Author: alexmarkov

flutter_frontend_server/lib/server.dart

@@ -147,8 +147,6 @@ Future<int> starter(
           '--target=flutter',
           '--track-widget-creation',
           '--enable-asserts',
-          '--gen-bytecode',
-          '--bytecode-options=source-positions,local-var-info,debugger-stops,instance-field-initializers,keep-unreachable-code,avoid-closure-call-instructions',
         ]);
         compiler ??= _FlutterFrontendCompiler(
           output,

shell/platform/fuchsia/dart_runner/dart_runner.cc

@@ -47,10 +47,6 @@ const char* kDartVMArgs[] = {
     "--precompilation",
 #else
     "--enable_mirrors=false",
-
-    // The interpreter is enabled unconditionally. If an app is built for
-    // debugging (that is, with no bytecode), the VM will fall back on ASTs.
-    "--enable_interpreter",
 #endif
 
     // No asserts in debug or release product.

shell/platform/fuchsia/dart_runner/kernel/BUILD.gn

@@ -22,10 +22,6 @@ compile_platform("kernel_platform_files") {
   args = [
     "--enable-experiment=non-nullable",
     "--nnbd-agnostic",
-
-    # TODO(dartbug.com/36342): enable bytecode for core libraries when performance of bytecode
-    # pipeline is on par with default pipeline and continuously tracked.
-    # "--bytecode",
     "--target=dart_runner",
     "dart:core",
   ]
@@ -75,7 +71,6 @@ template("create_kernel_core_snapshot") {
       # TODO(FL-117): Re-enable causal async stack traces when this issue is
       # addressed.
       "--no_causal_async_stacks",
-      "--use_bytecode_compiler",
       "--enable_mirrors=false",
       "--deterministic",
       "--snapshot_kind=core-jit",

shell/platform/fuchsia/flutter/component.cc

@@ -406,17 +406,6 @@ Application::Application(
   // addressed.
   settings_.dart_flags = {"--no_causal_async_stacks"};
 
-  // Disable code collection as it interferes with JIT code warmup
-  // by decreasing usage counters and flushing code which is still useful.
-  settings_.dart_flags.push_back("--no-collect_code");
-
-  if (!flutter::DartVM::IsRunningPrecompiledCode()) {
-    // The interpreter is enabled unconditionally in JIT mode. If an app is
-    // built for debugging (that is, with no bytecode), the VM will fall back on
-    // ASTs.
-    settings_.dart_flags.push_back("--enable_interpreter");
-  }
-
   // Don't collect CPU samples from Dart VM C++ code.
   settings_.dart_flags.push_back("--no_profile_vm");
 

shell/platform/fuchsia/flutter/kernel/BUILD.gn

@@ -22,10 +22,6 @@ compile_platform("kernel_platform_files") {
   args = [
     "--enable-experiment=non-nullable",
     "--nnbd-agnostic",
-
-    # TODO(dartbug.com/36342): enable bytecode for core libraries when performance of bytecode
-    # pipeline is on par with default pipeline and continuously tracked.
-    # "--bytecode",
     "--target=flutter_runner",
     "dart:core",
   ]
@@ -79,7 +75,6 @@ template("core_snapshot") {
       # TODO(FL-117): Re-enable causal async stack traces when this issue is
       # addressed.
       "--no_causal_async_stacks",
-      "--use_bytecode_compiler",
       "--enable_mirrors=false",
       "--deterministic",
       "--snapshot_kind=core-jit",