Optimization for miranda

• Optimize cava and edge detection schedules (CPU schedules are multi-core now).
• Add fork-extend pass to make fork dimensions multiple of some number (closes #28 (closed)).
• Make GCM add extra dimensions to per-thread arrays in fork-joins.
• Make GCM allocate extra memory for calls in parallel, make RT backend use different memories per parallel call.
• Make not finding xdot binary crash the compiler.
• Some misc. fixes.
• Add conv-like fork-join test.

hercules_cg/src/rt.rs

@@ -529,7 +529,7 @@ impl<'a> RTContext<'a> {
                 write!(block, "{} = ", self.get_value(id, bb, true))?;
                 let mut size_and_device = None;
                 match self.module.constants[cons_id.idx()] {
-                    Constant::Boolean(val) => write!(block, "{}bool", val)?,
+                    Constant::Boolean(val) => write!(block, "{}", val)?,
                     Constant::Integer8(val) => write!(block, "{}i8", val)?,
                     Constant::Integer16(val) => write!(block, "{}i16", val)?,
                     Constant::Integer32(val) => write!(block, "{}i32", val)?,