[turbofan] Remove obsolete --turbo-try-catch flag.

This removes the aforementioned flag which has been on by default for a
while now. Note that this does not control optimization decisions, only
the last-resort bailout in the graph builder.

R=bmeurer@chromium.org

Review URL: https://codereview.chromium.org/1335543002

Cr-Commit-Position: refs/heads/master@{#30673}

src/compiler/ast-graph-builder.cc

@@ -1422,9 +1422,6 @@ void AstGraphBuilder::VisitTryCatchStatement(TryCatchStatement* stmt) {
   // Evaluate the catch-block.
   VisitInScope(stmt->catch_block(), stmt->scope(), context);
   try_control.EndCatch();
-
-  // TODO(mstarzinger): Remove bailout once everything works.
-  if (!FLAG_turbo_try_catch) SetStackOverflow();
 }
 
 

src/flag-definitions.h

@@ -445,7 +445,6 @@ DEFINE_BOOL(turbo_verify_allocation, DEBUG_BOOL,
 DEFINE_BOOL(turbo_move_optimization, true, "optimize gap moves in TurboFan")
 DEFINE_BOOL(turbo_jt, true, "enable jump threading in TurboFan")
 DEFINE_BOOL(turbo_osr, true, "enable OSR in TurboFan")
-DEFINE_BOOL(turbo_try_catch, true, "enable try-catch support in TurboFan")
 DEFINE_BOOL(turbo_try_finally, false, "enable try-finally support in TurboFan")
 DEFINE_BOOL(turbo_stress_loop_peeling, false,
             "stress loop peeling optimization")

test/cctest/compiler/test-run-deopt.cc

@@ -63,7 +63,6 @@ TEST(DeoptSimpleInExpr) {
 
 TEST(DeoptExceptionHandlerCatch) {
   FLAG_allow_natives_syntax = true;
-  FLAG_turbo_try_catch = true;
 
   FunctionTester T(
       "(function f() {"

test/cctest/compiler/test-run-jsexceptions.cc

@@ -59,7 +59,6 @@ TEST(ThrowMessageDirectly) {
 
 
 TEST(ThrowMessageIndirectly) {
-  i::FLAG_turbo_try_catch = true;
   i::FLAG_turbo_try_finally = true;
   static const char* src =
       "(function(a, b) {"
@@ -81,7 +80,6 @@ TEST(ThrowMessageIndirectly) {
 
 
 TEST(Catch) {
-  i::FLAG_turbo_try_catch = true;
   const char* src =
       "(function(a,b) {"
       "  var r = '-';"
@@ -100,7 +98,6 @@ TEST(Catch) {
 
 
 TEST(CatchNested) {
-  i::FLAG_turbo_try_catch = true;
   const char* src =
       "(function(a,b) {"
       "  var r = '-';"
@@ -124,7 +121,6 @@ TEST(CatchNested) {
 
 
 TEST(CatchBreak) {
-  i::FLAG_turbo_try_catch = true;
   const char* src =
       "(function(a,b) {"
       "  var r = '-';"
@@ -149,7 +145,6 @@ TEST(CatchBreak) {
 
 
 TEST(CatchCall) {
-  i::FLAG_turbo_try_catch = true;
   const char* src =
       "(function(fun) {"
       "  var r = '-';"
@@ -213,7 +208,6 @@ TEST(FinallyBreak) {
 
 
 TEST(DeoptTry) {
-  i::FLAG_turbo_try_catch = true;
   const char* src =
       "(function f(a) {"
       "  try {"
@@ -230,7 +224,6 @@ TEST(DeoptTry) {
 
 
 TEST(DeoptCatch) {
-  i::FLAG_turbo_try_catch = true;
   const char* src =
       "(function f(a) {"
       "  try {"

test/cctest/test-api.cc

@@ -19253,7 +19253,6 @@ void CheckCorrectThrow(const char* script) {
 
 TEST(AccessCheckThrows) {
   i::FLAG_allow_natives_syntax = true;
-  i::FLAG_turbo_try_catch = true;
   v8::V8::Initialize();
   v8::V8::SetFailedAccessCheckCallbackFunction(&FailedAccessCheckThrows);
   v8::Isolate* isolate = CcTest::isolate();

test/cctest/test-heap.cc

@@ -6354,7 +6354,6 @@ TEST(MessageObjectLeak) {
   const char* flag = "--turbo-filter=*";
   FlagList::SetFlagsFromString(flag, StrLength(flag));
   FLAG_always_opt = true;
-  FLAG_turbo_try_catch = true;
   FLAG_turbo_try_finally = true;
 
   CompileRun(test);