Fix bogus deopt in BuildEmitDeepCopy for holey arrays.

test/mjsunit/regress/regress-crbug-242924.js

Index: test/mjsunit/regress/regress-crbug-242924.js
diff --git a/test/mjsunit/regress/regress-crbug-242870.js b/test/mjsunit/regress/regress-crbug-242924.js
similarity index 84%
copy from test/mjsunit/regress/regress-crbug-242870.js
copy to test/mjsunit/regress/regress-crbug-242924.js
index 7183375ca811cedc81c870d34e694e98cf727f9b..68ad7c6fd4e3e11b8f6d93e8b8afef01f4b143cd 100644
--- a/test/mjsunit/regress/regress-crbug-242870.js
+++ b/test/mjsunit/regress/regress-crbug-242924.js
@@ -25,19 +25,24 @@
 // (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 non_const_true = true;
+// Flags: --allow-natives-syntax --expose-gc --gc-global
 
 function f() {
-  return (non_const_true || true && g());
+  return [,{}];
 }
 
+assertEquals([,{}], f());
+assertEquals([,{}], f());
+%OptimizeFunctionOnNextCall(f);
+assertEquals([,{}], f());
+gc();
+
 function g() {
-  for (;;) {}
+  return [[,1.5],{}];
 }
 
-assertTrue(f());
-assertTrue(f());
-%OptimizeFunctionOnNextCall(f);
-assertTrue(f());
+assertEquals([[,1.5],{}], g());
+assertEquals([[,1.5],{}], g());
+%OptimizeFunctionOnNextCall(g);
+assertEquals([[,1.5],{}], g());
+gc();