Harden Function()'s parsing of function literals.

test/mjsunit/regress/regress-2470.js

Index: test/mjsunit/regress/regress-2470.js
diff --git a/test/mjsunit/parallel-optimize-disabled.js b/test/mjsunit/regress/regress-2470.js
similarity index 70%
copy from test/mjsunit/parallel-optimize-disabled.js
copy to test/mjsunit/regress/regress-2470.js
index 2487964bd99a5497c9166c52fe8de4862ac55ba9..eed381699d66de7f90f6a8ad2ff3ff59213134ab 100644
--- a/test/mjsunit/parallel-optimize-disabled.js
+++ b/test/mjsunit/regress/regress-2470.js
@@ -25,22 +25,18 @@
 // (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: --nodead-code-elimination --parallel-recompilation
-// Flags: --allow-natives-syntax
+// Test whether the opening parenthesis can be eaten up by a comment.
+assertThrows('Function("/*", "*/){");', SyntaxError);
 
-function g() {  // g() cannot be optimized.
-  const x = 1;
-  x++;
-}
+// Test whether the function literal can be closed prematurely.
+assertThrows('Function("});(function(){");', SyntaxError);
 
-function f(x) {
-  g();
-}
-
-f();
-f();
-%OptimizeFunctionOnNextCall(g, "parallel");
-%OptimizeFunctionOnNextCall(f);
-f(0);  // g() is disabled for optimization on inlining attempt.
-g();  // Attempt to optimize g() should not run into any assertion.
+// Test whether block comments are handled correctly.
+assertDoesNotThrow('Function("/*", "*/", "/**/");');
+assertDoesNotThrow('Function("/*", "a", "*/", "/**/");');
+assertThrows('Function("a", "/*", "*/", "/**/");', SyntaxError);
 
+// Test whether line comments are handled correctly.
+assertDoesNotThrow('Function("//", "//")');
+assertDoesNotThrow('Function("//", "//", "//")');
+assertThrows('Function("a", "//", "//")', SyntaxError);