Simplify computation of environment stack delta.

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;
@@ skipping 107 matching lines @@
 }
 
 
 TEST(CatchCall) {
   i::FLAG_turbo_exceptions = true;
   const char* src =
       "(function(fun) {"
       "  var r = '-';"
       "  try {"
       "    r += 'A-';"
-      "    fun();"
+      "    return r + 'B-' + fun();"
       "  } catch (e) {"
       "    r += e;"
       "  }"
       "  return r;"
       "})";
   FunctionTester T(src);
 
   CompileRun("function thrower() { throw 'T-'; }");
 #if 0  // TODO(mstarzinger): Enable once we have exception handlers.
   T.CheckCall(T.Val("-A-T-"), T.NewFunction("thrower"));
 #endif
+  CompileRun("function returner() { return 'R-'; }");
+  T.CheckCall(T.Val("-A-B-R-"), T.NewFunction("returner"));
 }
 
 
 TEST(Finally) {
   i::FLAG_turbo_exceptions = true;
   const char* src =
       "(function(a,b) {"
       "  var r = '-';"
       "  try {"
       "    r += 'A-';"
@@ skipping 23 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());
 }