Convert V1TImode register to TImode in debug insn

Convert V1TImode register to TImode in debug insn

TImode register referenced in debug insn can be converted to V1TImode
by scalar to vector optimization.  After converting a TImode register
to V1TImode, we need to check all debug insns on its use chain to
convert the V1TImode register to SUBREG TImode.

gcc/

2016-06-21  H.J. Lu  <hongjiu.lu@intel.com>
	    Ilya Enkovich  <ilya.enkovich@intel.com>

	PR target/71549
	* config/i386/i386.c (timode_scalar_chain::fix_debug_reg_uses):
	New member function to convert V1TImode register to SUBREG
	TImode in debug insn.
	(timode_scalar_chain::convert_insn): Call fix_debug_reg_uses
	after changing register mode to V1TImode.

gcc/testsuite/

2016-06-21  H.J. Lu  <hongjiu.lu@intel.com>

	PR target/71549
	* gcc.target/i386/pr71549.c: New test.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@237647 138bc75d-0d04-0410-961f-82ee72b054a4