Turn throws into basic block terminators.

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

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #include "test/cctest/compiler/function-tester.h"
 
 using namespace v8::internal;
 using namespace v8::internal::compiler;
 
 TEST(Throw) {
+  i::FLAG_turbo_exceptions = true;
   FunctionTester T("(function(a,b) { if (a) { throw b; } else { return b; }})");
 
   T.CheckThrows(T.true_value(), T.NewObject("new Error"));
   T.CheckCall(T.Val(23), T.false_value(), T.Val(23));
 }
 
 
 TEST(ThrowSourcePosition) {
   static const char* src =
       "(function(a, b) {        \n"
@@ skipping 127 matching lines @@
       "    r += 'D-';"
       "  }"
       "  return r;"
       "})";
   FunctionTester T(src);
 
   T.CheckCall(T.Val("-A-"), T.true_value(), T.false_value());
   T.CheckCall(T.Val("-A-B-D-"), T.false_value(), T.true_value());
   T.CheckCall(T.Val("-A-B-C-D-"), T.false_value(), T.false_value());
 }