[binutils-gdb] Remove last cleanups from d-exp.y

[sergiodj+buildbot at sergiodj dot net]

*** TEST RESULTS FOR COMMIT 5613c5857a020ca5189a73df7b58a234d0311bfb ***

Author: Tom Tromey <tom@tromey.com>
Branch: master
Commit: 5613c5857a020ca5189a73df7b58a234d0311bfb

Remove last cleanups from d-exp.y

This removes the last remaining cleanups from d-exp.y.

2017-09-05  Tom Tromey  <tom@tromey.com>

	* d-exp.y (PrimaryExpression): Use std::string.
	(d_parse): Don't create a cleanup.