Auto merge of #2911 - devnexen:netbsd_reg_constants, r=JohnTitor

netbsd mcontext x86_64 constants.

src/unix/bsd/netbsdlike/netbsd/mod.rs

@@ -2271,6 +2271,33 @@ pub const LSZOMB: ::c_int = 5;
 pub const LSONPROC: ::c_int = 7;
 pub const LSSUSPENDED: ::c_int = 8;
 
+pub const _REG_RDI: ::c_int = 0;
+pub const _REG_RSI: ::c_int = 1;
+pub const _REG_RDX: ::c_int = 2;
+pub const _REG_RCX: ::c_int = 3;
+pub const _REG_R8: ::c_int = 4;
+pub const _REG_R9: ::c_int = 5;
+pub const _REG_R10: ::c_int = 6;
+pub const _REG_R11: ::c_int = 7;
+pub const _REG_R12: ::c_int = 8;
+pub const _REG_R13: ::c_int = 9;
+pub const _REG_R14: ::c_int = 10;
+pub const _REG_R15: ::c_int = 11;
+pub const _REG_RBP: ::c_int = 12;
+pub const _REG_RBX: ::c_int = 13;
+pub const _REG_RAX: ::c_int = 14;
+pub const _REG_GS: ::c_int = 15;
+pub const _REG_FS: ::c_int = 16;
+pub const _REG_ES: ::c_int = 17;
+pub const _REG_DS: ::c_int = 18;
+pub const _REG_TRAPNO: ::c_int = 19;
+pub const _REG_ERR: ::c_int = 20;
+pub const _REG_RIP: ::c_int = 21;
+pub const _REG_CS: ::c_int = 22;
+pub const _REG_RFLAGS: ::c_int = 23;
+pub const _REG_RSP: ::c_int = 24;
+pub const _REG_SS: ::c_int = 25;
+
 const_fn! {
     {const} fn _ALIGN(p: usize) -> usize {
         (p + _ALIGNBYTES) & !_ALIGNBYTES