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/instruction_encoding.clif

@@ -0,0 +1,24 @@
+test cat
+
+target riscv32
+
+; regex: WS=[ \t]*
+
+function %foo(i32, i32) {
+ebb1(v0: i32 [%x8], v1: i32):
+    [-,-] v2 = iadd v0, v1
+    [-] trap heap_oob
+    [R#1234, %x5, %x11] v6, v7 = iadd_cout v2, v0
+    [Rshamt#beef, %x25] v8 = ishl_imm v6, 2
+@55 v9 = iadd v8, v7
+@a5 [Iret#5] return v0, v8
+}
+; sameln: function %foo(i32, i32) fast {
+; nextln: ebb1(v0: i32 [%x8], v1: i32):
+; nextln:     [-,-]$WS v2 = iadd v0, v1
+; nextln:     [-]$WS trap heap_oob
+; nextln:     [R#1234,%x5,%x11]$WS v6, v7 = iadd_cout v2, v0
+; nextln:     [Rshamt#beef,%x25]$WS v8 = ishl_imm v6, 2
+; nextln:     @0055 [-,-]$WS v9 = iadd v8, v7
+; nextln:     @00a5 [Iret#05]$WS return v0, v8
+; nextln: }