Always set the callee's context when calling a function from optimized code.

test/mjsunit/regress/regress-crbug-138887.js

Index: test/mjsunit/regress/regress-crbug-138887.js
diff --git a/test/mjsunit/pixel-array-rounding.js b/test/mjsunit/regress/regress-crbug-138887.js
old mode 100755
new mode 100644
similarity index 75%
copy from test/mjsunit/pixel-array-rounding.js
copy to test/mjsunit/regress/regress-crbug-138887.js
index 0c307e62e55297faefe3e2ae253e7a344f4ee6c6..8d8e1694b620aa36941f4b2e17a90f69f6a17cfa
--- a/test/mjsunit/pixel-array-rounding.js
+++ b/test/mjsunit/regress/regress-crbug-138887.js
@@ -27,18 +27,22 @@
 
 // Flags: --allow-natives-syntax
 
-var pixels = new Uint8ClampedArray(8);
+function worker1(ignored) {
+  return 100;
+}
 
-function f() {
-  for (var i = 0; i < 8; i++) {
-    pixels[i] = (i * 1.1);
+function factory(worker) {
+  return function(call_depth) {
+    if (call_depth == 0) return 10;
+    return 1 + worker(call_depth - 1);
   }
-  return pixels[1] + pixels[6];
 }
 
-f();
-f();
-assertEquals(6, pixels[5]);
-%OptimizeFunctionOnNextCall(f);
-f();
-assertEquals(6, pixels[5]);
+var f1 = factory(worker1);
+var f2 = factory(f1);
+assertEquals(11, f2(1));  // Result: 1 + f1(0) == 1 + 10.
+assertEquals(11, f2(1));
+%OptimizeFunctionOnNextCall(f1);
+assertEquals(10, f1(0));  // Terminates immediately -> returns 10.
+%OptimizeFunctionOnNextCall(f2);
+assertEquals(102, f2(1000));  // 1 + f1(999) == 1 + 1 + worker1(998) == 102