improve compression of if conditions (#2544)

test/compress/conditionals.js

@@ -1015,3 +1015,32 @@ delete_conditional_2: {
     }
     expect_stdout: true
 }
+
+issue_2535: {
+    options = {
+        booleans: true,
+        conditionals: true,
+        evaluate: true,
+        passes: 2,
+        side_effects: true,
+    }
+    input: {
+        if (true || x()) y();
+        if (true && x()) y();
+        if (x() || true) y();
+        if (x() && true) y();
+        if (false || x()) y();
+        if (false && x()) y();
+        if (x() || false) y();
+        if (x() && false) y();
+    }
+    expect: {
+        y();
+        x() && y();
+        (x(), 0) || y();
+        x() && y();
+        x() && y();
+        x() && y();
+        (x(), 1) || y();
+    }
+}

test/compress/dead-code.js

@@ -178,6 +178,8 @@ try_catch_finally: {
         conditionals: true,
         dead_code: true,
         evaluate: true,
+        passes: 2,
+        side_effects: true,
     }
     input: {
         var a = 1;

test/compress/functions.js

@@ -87,6 +87,7 @@ issue_485_crashing_1530: {
         dead_code: true,
         evaluate: true,
         inline: true,
+        side_effects: true,
     }
     input: {
         (function(a) {
@@ -94,9 +95,7 @@ issue_485_crashing_1530: {
             var b = 42;
         })(this);
     }
-    expect: {
-        this, void 0;
-    }
+    expect: {}
 }
 
 issue_1841_1: {

test/compress/global_defs.js

@@ -184,6 +184,7 @@ issue_2167: {
         global_defs: {
             "@isDevMode": "function(){}",
         },
+        passes: 2,
         side_effects: true,
     }
     input: {

test/compress/transform.js

@@ -68,6 +68,7 @@ label_if_break: {
         conditionals: true,
         dead_code: true,
         evaluate: true,
+        side_effects: true,
     }
     input: {
         L: if (true) {