Fix snapshotting

The flags that enable crankshaft in libv8 also need to be
passed into mksnapshot so that we generate a compatible
snapshot.cc.

Also remove the code that made crankshaft configurable as it
is now always on.

Change-Id: I3c2c58b1ef72269ea551752a7bb65baf8ad43b72
diff --git a/CleanSpec.mk b/CleanSpec.mk
index 49ab2c1..5f4ea42 100644
--- a/CleanSpec.mk
+++ b/CleanSpec.mk
@@ -53,6 +53,9 @@
 $(call add-clean-step, rm -rf $(OUT_DIR)/host/$(HOST_OS)-$(HOST_ARCH)/bin/mksnapshot)
 $(call add-clean-step, rm -rf $(OUT_DIR)/host/$(HOST_OS)-$(HOST_ARCH)/obj/EXECUTABLES/mksnapshot_intermediates)
 
+$(call add-clean-step, rm -rf $(PRODUCT_OUT)/obj/STATIC_LIBRARIES/libv8_intermediates)
+$(call add-clean-step, rm -rf $(OUT_DIR)/host/$(HOST_OS)-$(HOST_ARCH)/bin/mksnapshot)
+$(call add-clean-step, rm -rf $(OUT_DIR)/host/$(HOST_OS)-$(HOST_ARCH)/obj/EXECUTABLES/mksnapshot_intermediates)
 # ************************************************
 # NEWER CLEAN STEPS MUST BE AT THE END OF THE LIST
 # ************************************************