Add optimized ir examples

examples/opt/foo4.ir

@@ -0,0 +1,50 @@
+
+fun i32 @foo (i32, i32, i32) {
+init:
+  bid: b0
+  allocations: 
+
+
+block b0:
+  %b0:p0:i32:i
+  %b0:p1:i32:j
+  %b0:p2:i32:k
+  %b0:i0:i32 = add %b0:p0:i32 %b0:p1:i32
+  %b0:i1:i32 = add %b0:i0:i32 %b0:p2:i32
+  ret %b0:i1:i32
+}
+
+fun [ret:i32 params:(i32, i32, i32)]* @foo2 () {
+init:
+  bid: b0
+  allocations: 
+
+
+block b0:
+  ret @foo:[ret:i32 params:(i32, i32, i32)]*
+}
+
+fun [ret:[ret:i32 params:(i32, i32, i32)]* params:()]* @foo3 () {
+init:
+  bid: b0
+  allocations: 
+
+
+block b0:
+  ret @foo2:[ret:[ret:i32 params:(i32, i32, i32)]* params:()]*
+}
+
+fun i32 @main () {
+init:
+  bid: b0
+  allocations: 
+
+
+block b0:
+  %b0:i0:[ret:[ret:i32 params:(i32, i32, i32)]* params:()]* = call @foo3:[ret:[ret:[ret:i32 params:(i32, i32, i32)]* params:()]* params:()]*()
+  %b0:i1:[ret:i32 params:(i32, i32, i32)]* = call %b0:i0:[ret:[ret:i32 params:(i32, i32, i32)]* params:()]*()
+  %b0:i2:i32 = call %b0:i1:[ret:i32 params:(i32, i32, i32)]*(2:i32, 2:i32, 2:i32)
+  %b0:i3:u1 = cmp eq %b0:i2:i32 6:i32
+  %b0:i4:i32 = typecast %b0:i3:u1 to i32
+  ret %b0:i4:i32
+}