backport: re PR tree-optimization/82337 (ICE: SSA corruption at tree-ssa-coalesce...

backport: re PR tree-optimization/82337 (ICE: SSA corruption at tree-ssa-coalesce.c:1010)

[gcc]

2017-10-02  Bill Schmidt  <wschmidt@linux.vnet.ibm.com>

	Backport from mainline
	2017-09-29  Bill Schmidt  <wschmidt@linux.vnet.ibm.com>

	PR tree-optimization/82337
	* gimple-ssa-strength-reduction.c (find_phi_def): Don't record a
	phi definition if the PHI result appears in an abnormal PHI.
	(find_basis_for_base_expr): Don't record a basis if the LHS of the
	basis appears in an abnormal PHI.

[gcc]

2017-10-02  Bill Schmidt  <wschmidt@linux.vnet.ibm.com>

	Backport from mainline
	2017-09-29  Bill Schmidt  <wschmidt@linux.vnet.ibm.com>

	PR tree-optimization/82337
	* gcc.c-torture/compile/pr82337.c: New file.

From-SVN: r253361