test: Disable some varargs behavior tests on sparc.

ziglang#23718

Author: alexrp

test/behavior/var_args.zig

@@ -106,6 +106,7 @@ test "simple variadic function" {
  }
  if (builtin.cpu.arch == .x86_64 and builtin.os.tag == .windows) return error.SkipZigTest; // TODO
  if (builtin.cpu.arch == .s390x and builtin.zig_backend == .stage2_llvm) return error.SkipZigTest; // https://github.com/ziglang/zig/issues/21350
+ if (builtin.cpu.arch.isSPARC() and builtin.zig_backend == .stage2_llvm) return error.SkipZigTest; // https://github.com/ziglang/zig/issues/23718
 
  const S = struct {
  fn simple(...) callconv(.c) c_int {
@@ -200,6 +201,7 @@ test "variadic functions" {
  }
  if (builtin.cpu.arch == .x86_64 and builtin.os.tag == .windows) return error.SkipZigTest; // TODO
  if (builtin.cpu.arch == .s390x and builtin.zig_backend == .stage2_llvm) return error.SkipZigTest; // https://github.com/ziglang/zig/issues/21350
+ if (builtin.cpu.arch.isSPARC() and builtin.zig_backend == .stage2_llvm) return error.SkipZigTest; // https://github.com/ziglang/zig/issues/23718
 
  const S = struct {
  fn printf(list_ptr: *std.ArrayList(u8), format: [*:0]const u8, ...) callconv(.c) void {
@@ -245,6 +247,7 @@ test "copy VaList" {
  }
  if (builtin.cpu.arch == .x86_64 and builtin.os.tag == .windows) return error.SkipZigTest; // TODO
  if (builtin.cpu.arch == .s390x and builtin.zig_backend == .stage2_llvm) return error.SkipZigTest; // https://github.com/ziglang/zig/issues/21350
+ if (builtin.cpu.arch.isSPARC() and builtin.zig_backend == .stage2_llvm) return error.SkipZigTest; // https://github.com/ziglang/zig/issues/23718
 
  const S = struct {
  fn add(count: c_int, ...) callconv(.c) c_int {
@@ -282,6 +285,7 @@ test "unused VaList arg" {
  return error.SkipZigTest; // TODO
  }
  if (builtin.cpu.arch == .s390x and builtin.zig_backend == .stage2_llvm) return error.SkipZigTest; // https://github.com/ziglang/zig/issues/21350
+ if (builtin.cpu.arch.isSPARC() and builtin.zig_backend == .stage2_llvm) return error.SkipZigTest; // https://github.com/ziglang/zig/issues/23718
 
  const S = struct {
  fn thirdArg(dummy: c_int, ...) callconv(.c) c_int {