Add a bconst instruction. (#116)

* Add a bconst instruction.

lib/cretonne/src/ir/instructions.rs

@@ -107,6 +107,7 @@ pub enum InstructionData {
     UnaryImm { opcode: Opcode, imm: Imm64 },
     UnaryIeee32 { opcode: Opcode, imm: Ieee32 },
     UnaryIeee64 { opcode: Opcode, imm: Ieee64 },
+    UnaryBool { opcode: Opcode, imm: bool },
     Binary { opcode: Opcode, args: [Value; 2] },
     BinaryImm {
         opcode: Opcode,

lib/cretonne/src/verifier/mod.rs

@@ -273,6 +273,7 @@ impl<'a> Verifier<'a> {
             UnaryImm { .. } |
             UnaryIeee32 { .. } |
             UnaryIeee64 { .. } |
+            UnaryBool { .. } |
             Binary { .. } |
             BinaryImm { .. } |
             Ternary { .. } |

lib/cretonne/src/write.rs

@@ -243,6 +243,7 @@ pub fn write_operands(w: &mut Write,
         UnaryImm { imm, .. } => write!(w, " {}", imm),
         UnaryIeee32 { imm, .. } => write!(w, " {}", imm),
         UnaryIeee64 { imm, .. } => write!(w, " {}", imm),
+        UnaryBool { imm, .. } => write!(w, " {}", imm),
         Binary { args, .. } => write!(w, " {}, {}", args[0], args[1]),
         BinaryImm { arg, imm, .. } => write!(w, " {}, {}", arg, imm),
         Ternary { args, .. } => write!(w, " {}, {}, {}", args[0], args[1], args[2]),