Fix pre-parsing of 'use strict' directive after string literals.

test/mjsunit/regress/regress-parse-use-strict.js

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-// Flags: --harmony-iteration
+// Filler long enough to trigger lazy parsing.
+var filler = "/*" + new Array(1024).join('x') + "*/";
 
-// Filler long enough to trigger lazy parsing.
-var filler = "//" + new Array(1024).join('x');
+// Snippet trying to switch to strict mode.
+var strict = '"use strict"; with({}) {}';
 
-// Test that the pre-parser does not crash when the expected contextual
-// keyword as part if a 'for' statement is not and identifier.
-try {
-  eval(filler + "\nfunction f() { for (x : y) { } }");
-  throw "not reached";
-} catch (e) {
-  if (!(e instanceof SyntaxError)) throw e;
-}
+// Test switching to strict mode after string literal.
+assertThrows('function f() { "use sanity";' + strict + '}');
+assertThrows('function f() { "use sanity";' + strict + filler + '}');
+
+// Test switching to strict mode after function declaration.
+// We must use eval instead of assertDoesNotThrow here to make sure that
+// lazy parsing is triggered. Otherwise the bug won't reproduce.
+eval('function f() { function g() {}' + strict + '}');
+eval('function f() { function g() {}' + strict + filler + '}');