Harden Function()'s parsing of function literals.

test/mjsunit/regress/regress-2470.js

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-// 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();
-}
+// Test whether block comments are handled correctly.
+assertDoesNotThrow('Function("/*", "*/", "/**/");');
+assertDoesNotThrow('Function("/*", "a", "*/", "/**/");');
+assertThrows('Function("a", "/*", "*/", "/**/");', SyntaxError);
 
-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 line comments are handled correctly.
+assertDoesNotThrow('Function("//", "//")');
+assertDoesNotThrow('Function("//", "//", "//")');
+assertThrows('Function("a", "//", "//")', SyntaxError);