refactor Reloc to an enum of every architecture's reloc types

https://github.com/stoklund/cretonne/pull/206#issuecomment-350905016

lib/cretonne/src/isa/intel/binemit.rs

@@ -9,26 +9,6 @@ use super::registers::RU;
 
 include!(concat!(env!("OUT_DIR"), "/binemit-intel.rs"));
 
-/// Intel relocations.
-pub enum RelocKind {
-    /// A 4-byte relative function reference. Based from relocation + 4 bytes.
-    PCRel4,
-
-    /// A 4-byte absolute function reference.
-    Abs4,
-
-    /// An 8-byte absolute function reference.
-    Abs8,
-}
-
-pub static RELOC_NAMES: [&'static str; 3] = ["PCRel4", "Abs4", "Abs8"];
-
-impl Into<Reloc> for RelocKind {
-    fn into(self) -> Reloc {
-        Reloc(self as u16)
-    }
-}
-
 // Convert a stack base to the corresponding register.
 fn stk_base(base: StackBase) -> RegUnit {
     let ru = match base {