libclc: Fix amdgpu subgroup reduce for max u64 (#188598)

GitOrigin-RevId: dd57b4552202f3ef816c6d49781d6f1550e98484

clc/lib/amdgpu/subgroup/clc_sub_group_reduce.cl

diff --git a/clc/lib/amdgpu/subgroup/clc_sub_group_reduce.cl b/clc/lib/amdgpu/subgroup/clc_sub_group_reduce.cl
index 7ab49f0..66d0130 100644
--- a/clc/lib/amdgpu/subgroup/clc_sub_group_reduce.cl
+++ b/clc/lib/amdgpu/subgroup/clc_sub_group_reduce.cl
@@ -49,7 +49,7 @@
 }
 
 _CLC_DEF _CLC_OVERLOAD _CLC_CONST ulong __clc_sub_group_reduce_max(ulong x) {
-  return __builtin_amdgcn_wave_reduce_max_u32(x, 0);
+  return __builtin_amdgcn_wave_reduce_max_u64(x, 0);
 }
 
 _CLC_DEF _CLC_OVERLOAD _CLC_CONST long __clc_sub_group_reduce_max(long x) {