More tests and fixes (unary, binary, globals)

tests/compiler/if.ts

@@ -0,0 +1,22 @@
+export function ifThenElse(n: i32): bool {
+  if (n)
+    return true;
+  else
+    return false;
+}
+
+export function ifThen(n: i32): bool {
+  if (n)
+    return true;
+  return false;
+}
+
+export function ifThenElseBlock(n: i32): bool {
+  if (n) {
+    ; // nop
+    return true;
+  } else {
+    ; // nop
+    return false;
+  }
+}