[pushed] testsuite: Add case-values-threshold to pr107876.C

[Richard Sandiford <richard.sandiford@arm.com>]

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.

Tested on aarch64-linux-gnu & x86_64-linux-gnu.  Pushed as obvious.

Richard


gcc/testsuite/
	* g++.dg/tree-ssa/pr107876.C: Add --param case-values-threshold=4.
---
 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:
-- 
2.25.1