[gcc/devel/omp/gcc-10] go.test: update issue4085b.go to version from Go 1.13

[Tobias Burnus]

https://gcc.gnu.org/g:703f9d8687ecbd86cd88ec0bf16088bb9e36303e

commit 703f9d8687ecbd86cd88ec0bf16088bb9e36303e
Author: Ian Lance Taylor <iant@golang.org>
Date:   Fri Jun 12 14:00:11 2020 -0700

    go.test: update issue4085b.go to version from Go 1.13
    
    This lets the test pass on AIX.
    
    Not updating to master because we get slightly different error messages,
    so that is a more complex change.

Diff:
---
 gcc/testsuite/go.test/test/fixedbugs/issue4085b.go | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/gcc/testsuite/go.test/test/fixedbugs/issue4085b.go b/gcc/testsuite/go.test/test/fixedbugs/issue4085b.go
index 6bf315fcc2f..6304ce073aa 100644
--- a/gcc/testsuite/go.test/test/fixedbugs/issue4085b.go
+++ b/gcc/testsuite/go.test/test/fixedbugs/issue4085b.go
@@ -21,9 +21,11 @@ func main() {
 	shouldPanic("cap out of range", func() { _ = make(T, 0, int64(n)) })
 	var t *byte
 	if unsafe.Sizeof(t) == 8 {
-		var n2 int64 = 1 << 50
+		// Test mem > maxAlloc
+		var n2 int64 = 1 << 59
 		shouldPanic("len out of range", func() { _ = make(T, int(n2)) })
 		shouldPanic("cap out of range", func() { _ = make(T, 0, int(n2)) })
+		// Test elem.size*cap overflow
 		n2 = 1<<63 - 1
 		shouldPanic("len out of range", func() { _ = make(T, int(n2)) })
 		shouldPanic("cap out of range", func() { _ = make(T, 0, int(n2)) })