Merge pull request #4230 from martin-frbg/lapack907

Increase work array size in S/DTGEX2 to avoid overflow (Reference-LAPACK PR 907)

lapack-netlib/SRC/dtgex2.f

@@ -254,7 +254,7 @@
      $                   THRESHA, THRESHB
 *     ..
 *     .. Local Arrays ..
-      INTEGER            IWORK( LDST )
+      INTEGER            IWORK( LDST + 2 )
       DOUBLE PRECISION   AI( 2 ), AR( 2 ), BE( 2 ), IR( LDST, LDST ),
      $                   IRCOP( LDST, LDST ), LI( LDST, LDST ),
      $                   LICOP( LDST, LDST ), S( LDST, LDST ),

lapack-netlib/SRC/stgex2.f

@@ -255,7 +255,7 @@
      $                   THRESHA, THRESHB
 *     ..
 *     .. Local Arrays ..
-      INTEGER            IWORK( LDST )
+      INTEGER            IWORK( LDST + 2 )
       REAL               AI( 2 ), AR( 2 ), BE( 2 ), IR( LDST, LDST ),
      $                   IRCOP( LDST, LDST ), LI( LDST, LDST ),
      $                   LICOP( LDST, LDST ), S( LDST, LDST ),