Fix PR testsuite/90806 on the 9 branch

[Eric Botcazou]

The underlying bug was fixed by Marc in July 2019:

2019-07-10  Marc Glisse  <marc.gli...@inria.fr>

        * wide-int.h (wi::lshift): Reject negative values for the fastpath.

and Richard B. agreed to the backport onto the 9 branch.

Bootstrapped/regtested and applied on the 9 branch.


2021-01-06  Eric Botcazou <ebotca...@adacore.com>

        PR testsuite/90806
        Backport from mainline
        2019-07-10  Marc Glisse  <marc.gli...@inria.fr>

        * wide-int.h (wi::lshift): Reject negative values for the fastpath.

-- 
Eric Botcazou
diff --git a/gcc/wide-int.h b/gcc/wide-int.h
index 25ea0545439..77aa01f2c98 100644
--- a/gcc/wide-int.h
+++ b/gcc/wide-int.h
@@ -3032,8 +3032,7 @@ wi::lshift (const T1 &x, const T2 &y)
       if (STATIC_CONSTANT_P (xi.precision > HOST_BITS_PER_WIDE_INT)
 	  ? (STATIC_CONSTANT_P (shift < HOST_BITS_PER_WIDE_INT - 1)
 	     && xi.len == 1
-	     && xi.val[0] <= (HOST_WIDE_INT) ((unsigned HOST_WIDE_INT)
-					      HOST_WIDE_INT_MAX >> shift))
+	     && IN_RANGE (xi.val[0], 0, HOST_WIDE_INT_MAX >> shift))
 	  : precision <= HOST_BITS_PER_WIDE_INT)
 	{
 	  val[0] = xi.ulow () << shift;