[PATCH 4/9] libstdc++ changes for ia16

[Andrew Jenner]

2017-04-01  Andrew Jenner  <andrew@codesourcery.com>

	* src/c++11/cow-stdexcept.cc (_ITM_RU2): Declare.
	(txnal_read_ptr): Allow 16-bit pointers.
	* src/c++11/codecvt.cc (read_utf8_code_point): Handle 16-bit int.


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