Support multiple primary functions in a single snapshot. (#1797)

This patch adds an extension to snapshots which allows storing
multiple position independent primary functions in a single
snapshot data. A new application called jerry-snapshot is
added to the project to manage snapshots. Currently the only
option is merging snapshots.

JerryScript-DCO-1.0-Signed-off-by: Zoltan Herczeg zherczeg.u-szeged@partner.samsung.com

tools/run-tests.py

@@ -128,6 +128,8 @@ JERRY_BUILDOPTIONS = [
             ['--jerry-libc=off', '--compile-flag=-m32', '--cpointer-32bit=on', '--system-allocator=on']),
     Options('buildoption_test-external_context',
             ['--jerry-libc=off', '--external-context=on']),
+    Options('buildoption_test-snapshot_tool',
+            ['--jerry-cmdline-snapshot=on']),
 ]
 
 def get_arguments():