[HarfBuzz] Malayalam: hb-view crash happened when display

[datao zhang]

Hi:
 
After i update the latest commit, crash happened when i try to display ക്ക്രെ <





U+0D15,U+0D4D,U+0D15,U+0D4D,U+0D30,U+0D46>. Please refer to the attachment.
 
Br,
Dean
  		 	   		  
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