Enable string slices.

Review URL: http://codereview.chromium.org/8218002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9554 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/flag-definitions.h

@@ -105,7 +105,7 @@ DEFINE_bool(harmony_block_scoping, false, "enable harmony block scoping")
 // Flags for experimental implementation features.
 DEFINE_bool(unbox_double_arrays, true, "automatically unbox arrays of doubles")
 DEFINE_bool(smi_only_arrays, false, "tracks arrays with only smi values")
-DEFINE_bool(string_slices, false, "use string slices")
+DEFINE_bool(string_slices, true, "use string slices")
 
 // Flags for Crankshaft.
 #ifdef V8_TARGET_ARCH_MIPS