[Patch, fortran] Rename gfc_code's expr4 field

[Mikael Morin]

Hello,

this renames the expr4 field of gfc_code to the more descriptive 
ext.lock.acquired_lock.
Regression tested on x86_64-unkown-linux-gnu.  OK for trunk?

Mikael
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2015-08-05  Mikael Morin  <mikael@gcc.gnu.org>

	* gfortran.h (struct gfc_code): Move expr4 field to
	ext.lock.acquired_lock.
	* dump-parse-tree.c (show_code_node): Update field usage.
	* frontend-passes.c (gfc_code_walker): Likewise.
	* match.c (lock_unlock_statement): Likewise.
	* resolve.c (resolve_lock_unlock): Likewise.
	* trans-stmt.c (gfc_trans_lock_unlock): Likewise.
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