[gcc r13-5656] testsuite: Add case-values-threshold to pr107876.C

[Richard Sandiford <rsandifo@gcc.gnu.org>]

https://gcc.gnu.org/g:5b7b9d2da7691abba0a86c6e6c6935e29f365191

commit r13-5656-g5b7b9d2da7691abba0a86c6e6c6935e29f365191
Author: Richard Sandiford <richard.sandiford@arm.com>
Date:   Thu Feb 2 14:53:33 2023 +0000

    testsuite: Add case-values-threshold to pr107876.C
    
    This test was failing on aarch64 because aarch64 overrides
    TARGET_CASE_VALUES_THRESHOLD.  The maximum value that allows
    the test to pass appears to be 6, but the default threshold
    is 4 or 5 (depending on whether casesi is provided).
    Going for 4 seemed safest, in case any target-specific
    features force the maximum passing threshold to be lower
    on some targets.
    
    gcc/testsuite/
            * g++.dg/tree-ssa/pr107876.C: Add --param case-values-threshold=4.

Diff:
---
 gcc/testsuite/g++.dg/tree-ssa/pr107876.C | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gcc/testsuite/g++.dg/tree-ssa/pr107876.C b/gcc/testsuite/g++.dg/tree-ssa/pr107876.C
index 6cff2f1b166..d920ba050ea 100644
--- a/gcc/testsuite/g++.dg/tree-ssa/pr107876.C
+++ b/gcc/testsuite/g++.dg/tree-ssa/pr107876.C
@@ -1,6 +1,6 @@
 // { dg-do compile }
 // { dg-require-effective-target c++11 }
-// { dg-options "-O2 -funswitch-loops --param max-unswitch-insns=5 -fdump-tree-unswitch-details" }
+// { dg-options "-O2 -funswitch-loops --param max-unswitch-insns=5 --param case-values-threshold=4 -fdump-tree-unswitch-details" }
 
 class X {
 public: