Auto merge of #2930 - devnexen:solarish_regset_amd64, r=JohnTitor

solarish amd64 regset constants

src/unix/solarish/x86_64.rs

@@ -157,3 +157,34 @@ cfg_if! {
 
     }
 }
+
+// sys/regset.h
+
+pub const REG_GSBASE: ::c_int = 27;
+pub const REG_FSBASE: ::c_int = 26;
+pub const REG_DS: ::c_int = 25;
+pub const REG_ES: ::c_int = 24;
+pub const REG_GS: ::c_int = 23;
+pub const REG_FS: ::c_int = 22;
+pub const REG_SS: ::c_int = 21;
+pub const REG_RSP: ::c_int = 20;
+pub const REG_RFL: ::c_int = 19;
+pub const REG_CS: ::c_int = 18;
+pub const REG_RIP: ::c_int = 17;
+pub const REG_ERR: ::c_int = 16;
+pub const REG_TRAPNO: ::c_int = 15;
+pub const REG_RAX: ::c_int = 14;
+pub const REG_RCX: ::c_int = 13;
+pub const REG_RDX: ::c_int = 12;
+pub const REG_RBX: ::c_int = 11;
+pub const REG_RBP: ::c_int = 10;
+pub const REG_RSI: ::c_int = 9;
+pub const REG_RDI: ::c_int = 8;
+pub const REG_R8: ::c_int = 7;
+pub const REG_R9: ::c_int = 6;
+pub const REG_R10: ::c_int = 5;
+pub const REG_R11: ::c_int = 4;
+pub const REG_R12: ::c_int = 3;
+pub const REG_R13: ::c_int = 2;
+pub const REG_R14: ::c_int = 1;
+pub const REG_R15: ::c_int = 0;