closure: add sparc64 support (#26731)

* closure: add sparc64 support

* missed comma

* add sparc64 to native too

Author: tankf33der

vlib/builtin/closure/closure.c.v

@@ -97,6 +97,17 @@ pub const closure_thunk = $if ppc64le {
         0x51, 0x22, 0xC0, 0x28,  // ld.d      t5, t6, 8
         0x20, 0x02, 0x00, 0x4C,  // jr        t5
     ]!
+} $else $if sparc64 {
+    [
+    u8(0x83), 0x41, 0x40, 0x00,  // rd  %pc, %g1
+        0x05, 0x00, 0x00, 0x10,  // sethi  %hi(0x4000), %g2
+        0x84, 0x10, 0xa0, 0x00,  // mov  %g2, %g2   ! 4000 <main>
+        0x82, 0x20, 0x40, 0x02,  // sub  %g1, %g2, %g1
+        0xff, 0x18, 0x60, 0x00,  // ldd  [ %l1 ], %d62
+        0xc2, 0x58, 0x60, 0x08,  // ldx  [ %g1 + 8 ], %g1
+        0x81, 0xc0, 0x40, 0x00,  // jmp  %g1
+        0x01, 0x00, 0x00, 0x00   // nop
+    ]!
 } $else {
     [u8(0)]!
 }
@@ -150,6 +161,12 @@ const closure_get_data_bytes = $if arm32 {
     u8(0x04), 0xB9, 0x14, 0x01,  // movfr2gr.d a0, f8
         0x20, 0x00, 0x00, 0x4C,  // ret
     ]!
+} $else $if sparc64 {
+    [
+    u8(0x91), 0xb0, 0x22, 0x1f,  // movdtox %f62, %o0
+        0x81, 0xc3, 0xe0, 0x08,  // retl
+        0x01, 0x00, 0x00, 0x00   // nop
+    ]!
 } $else {
     [u8(0)]!
 }

vlib/v/gen/native/comptime.v

@@ -170,7 +170,7 @@ fn (mut g Gen) comptime_ident(name string, is_comptime_option bool) bool {
 		'x86', 'x32', 'i386', 'arm32', 'rv32' {
 			false // native only supports 64-bit systems
 		}
-		'rv64', 's390x', 'ppc64le', 'loongarch64' {
+		'rv64', 's390x', 'ppc64le', 'loongarch64', 'sparc64' {
 			false // not support yet
 		}
 		'little_endian' {