Move the wasmtime crate directories form lib/* to wasmtime-*.

This follows a similar change to Cranelift made here:

https://github.com/CraneStation/cranelift/pull/660

wasmtime-obj/src/table.rs

@@ -0,0 +1,24 @@
+use faerie::{Artifact, Decl};
+
+/// Declares data segment symbol
+pub fn declare_table(obj: &mut Artifact, index: usize) -> Result<(), String> {
+    let name = format!("_table_{}", index);
+    obj.declare(
+        name,
+        Decl::Data {
+            writable: false,
+            global: false,
+        },
+    )
+    .map_err(|err| format!("{}", err))?;
+    Ok(())
+}
+
+/// Emit segment data and initialization location
+pub fn emit_table(obj: &mut Artifact, index: usize) -> Result<(), String> {
+    let name = format!("_table_{}", index);
+    // FIXME: We need to initialize table using function symbols
+    obj.define(name, Vec::new())
+        .map_err(|err| format!("{}", err))?;
+    Ok(())
+}