sparc ABI issue - structure returning from function is returned

in 64bit registers

Fixes: #52638

Author: psumbera

src/librustc_target/abi/call/sparc64.rs

@@ -57,16 +57,7 @@ fn classify_ret_ty<'a, Ty, C>(cx: C, ret: &mut ArgType<'a, Ty>)
     let size = ret.layout.size;
     let bits = size.bits();
     if bits <= 256 {
-        let unit = if bits <= 8 {
-            Reg::i8()
-        } else if bits <= 16 {
-            Reg::i16()
-        } else if bits <= 32 {
-            Reg::i32()
-        } else {
-            Reg::i64()
-        };
-
+        let unit = Reg::i64();
         ret.cast_to(Uniform {
             unit,
             total: size