enhance inline (#5105)

test/compress/awaits.js

@@ -227,7 +227,7 @@ inline_await_1_trim: {
         console.log("PASS");
     }
     expect: {
-        void 0;
+        0;
         console.log("PASS");
     }
     expect_stdout: "PASS"
@@ -571,7 +571,7 @@ drop_async_1: {
     }
     expect: {
         console.log(function(a) {
-            void (a *= 7);
+            a *= 7;
             return a;
         }(6));
     }
@@ -1774,7 +1774,7 @@ issue_5001: {
     }
     expect: {
         var a = 0;
-        void a++;
+        a++;
         console.log(a ? "PASS" : "FAIL");
     }
     expect_stdout: "PASS"

test/compress/drop-unused.js

@@ -1557,9 +1557,9 @@ issue_2665: {
     }
     expect: {
         var a = 1;
-        !function g() {
+        (function g() {
             a-- && g();
-        }();
+        })();
         console.log(a);
     }
     expect_stdout: "-1"
@@ -3379,7 +3379,7 @@ issue_4834: {
     }
     expect: {
         try {
-            void b.p;
+            b.p;
         } catch (e) {
             console.log("PASS");
         }

test/compress/functions.js

@@ -1171,11 +1171,11 @@ issue_2620_4: {
     }
     expect: {
         var c = "FAIL";
-        !function() {
+        (function() {
             switch (NaN) {
               case void (c = "PASS"):
             }
-        }();
+        })();
         console.log(c);
     }
     expect_stdout: "PASS"
@@ -6565,3 +6565,38 @@ issue_5098: {
     }
     expect_stdout: "PASS"
 }
+
+shorter_without_void: {
+    options = {
+        inline: true,
+        passes: 2,
+        reduce_vars: true,
+        side_effects: true,
+        toplevel: true,
+    }
+    input: {
+        var a;
+        function f(b) {
+            a = b;
+        }
+        f("foo");
+        console.log(a) || f("bar");
+        console.log(a, f("baz"));
+        console.log(a);
+    }
+    expect: {
+        var a;
+        function f(b) {
+            a = b;
+        }
+        a = "foo";
+        console.log(a) || (a = "bar");
+        console.log(a, f("baz"));
+        console.log(a);
+    }
+    expect_stdout: [
+        "foo",
+        "bar undefined",
+        "baz",
+    ]
+}