Péter Gál d637e31933 On simple strings the utf8 substring copy api call created an assert (#2389)
When the `jerry_substring_to_utf8_char_buffer` was called
with direct strings the assert incorrectly assumed that the
string is a ref counted string and tried to access the
refcount value resulting in a failed assert.

Added direct string check for the underlying implementation
and created a test case for such simple string.

JerryScript-DCO-1.0-Signed-off-by: Peter Gal pgal.u-szeged@partner.samsung.com
2018-06-11 10:19:39 +09:00
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