Implement reference counting (#592)

tests/compiler/inlining-blocklocals.ts

@@ -0,0 +1,23 @@
+var b: i32 = 2;
+
+var theCall_a: i32;
+var theCall_b: i32;
+var theCall_c: i32;
+
+@inline function theCall(a: i32, b: i32, c: i32): void {
+  theCall_a = a;
+  theCall_b = b;
+  theCall_c = c;
+}
+
+function test(): void {
+  var a = 1;
+  // see comment in Compiler#makeCallInlinePrechecked
+  // theCall($3, $2=[except $3], $1=[except $3,$2])
+  theCall(a++, b++, ++a);
+  assert(theCall_a == 1);
+  assert(theCall_b == 2);
+  assert(theCall_c == 3);
+  assert(a == 3);
+}
+test();