remove sparc64 test case which is tripping llvm assertion

See #12011

test/cases/sparc64-linux/hello_world.zig

@@ -1,22 +0,0 @@
-const msg = "Hello, World!\n";
-
-fn length() usize {
-    return msg.len;
-}
-
-pub fn main() void {
-    asm volatile ("ta 0x6d"
-        :
-        : [number] "{g1}" (4),
-          [arg1] "{o0}" (1),
-          [arg2] "{o1}" (@ptrToInt(msg)),
-          [arg3] "{o2}" (length()),
-        : "o0", "o1", "o2", "o3", "o4", "o5", "o6", "o7", "memory"
-    );
-}
-
-// run
-// target=sparc64-linux
-//
-// Hello, World!
-//