Fix deoptimization bug, where recursive call can frighten and confuse the unwitting, simple, poor c…

test/mjsunit/compiler/regress-shared-deopt.js

 // Copyright 2013 the V8 project authors. All rights reserved.
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 //
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 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 // Flags: --allow-natives-syntax
 
+var soft = false;
+
+// disable optimization of this global
+soft = true;
+soft = false;
+soft = true;
+soft = false;
+
 function test() {
-  var string = %NewString(10, true);
-  for (var i = 0; i < 10; i++) {
-    %_OneByteSeqStringSetChar(string, i, 65);
-    %_OneByteSeqStringSetChar(string, i, 66);
+  var f4 = makeF(4);
+  var f5 = makeF(5);
+
+  function makeF(i) {
+    return function f(x) {
+      if (x == 0) return i;
+      if (i == 4) if (soft) print("wahoo" + i);
+      return f4(x - 1);
+    }
   }
-  for (var i = 0; i < 10; i++) {
-    assertEquals("B", string[i]);
-  }
+
+  f4(9);
+  f4(11);
+  %OptimizeFunctionOnNextCall(f4);
+  f4(12);
+
+  f5(9);
+  f5(11);
+  %OptimizeFunctionOnNextCall(f5);
+  f5(12);
+
+  soft = true;
+  f4(1);
+  f5(9);
 }
 
 test();
-test();
-%OptimizeFunctionOnNextCall(test);
-test();
-