moved crates in lib/ to src/, renamed crates, modified some files' text (#660)

moved crates in lib/ to src/, renamed crates, modified some files' text (#660)

cranelift/filetests/filetests/parser/alias.clif

@@ -0,0 +1,32 @@
+test cat
+test verifier
+
+function %basic(i32, i32) -> i32 {
+ebb0(v0: i32, v1: i32):
+    v2 -> v0
+    v3 -> v1
+    v4 = iadd.i32 v2, v3
+    return v4
+}
+
+function %transitive() -> i32 {
+ebb0:
+    v0 = iconst.i32 0
+    v1 -> v0
+    v2 -> v1
+    v3 -> v2
+    v4 -> v3
+    return v4
+}
+
+function %duplicate(i32, i32) -> i32 {
+ebb0(v0: i32, v1: i32):
+    v2 -> v0
+    v2 -> v0
+    v2 -> v0
+    v3 -> v1
+    v3 -> v1
+    v3 -> v1
+    v4 = iadd.i32 v2, v3
+    return v4
+}