Remove old tests that have been migrated to the v8 repo.

LayoutTests/fast/regex/script-tests/overflow.js

Index: LayoutTests/fast/regex/script-tests/overflow.js
diff --git a/LayoutTests/fast/regex/script-tests/overflow.js b/LayoutTests/fast/regex/script-tests/overflow.js
deleted file mode 100644
index 0f66460849a480120692f18d33441cb2fb2c9471..0000000000000000000000000000000000000000
--- a/LayoutTests/fast/regex/script-tests/overflow.js
+++ /dev/null
@@ -1,13 +0,0 @@
-description("This test checks expressions with alternative lengths of appox. 2^31.");
-
-var regexp1 = /(?:(?=g))|(?:m).{2147483648,}/;
-shouldBe("regexp1.exec('')", 'null');
-
-var regexp2 = /(?:(?=g)).{2147483648,}/;
-shouldBe("regexp2.exec('')", 'null');
-
-var s3 = "&{6}u4a64YfQP{C}u88c4u5772Qu8693{4294967167}u85f2u7f3fs((uf202){4})u5bc6u1947";
-var regexp3 = new RegExp(s3, "");
-shouldBe("regexp3.exec(s3)", 'null');
-
-shouldThrow("function f() { /[^a$]{4294967295}/ }", '"SyntaxError: Invalid regular expression: number too large in {} quantifier"');