fix corner cases with template literals (#4780)

lib/compress.js

@@ -1511,6 +1511,8 @@ merge(Compressor.prototype, {
         var wrap = false;
         if (parent.TYPE == "Call") {
             wrap = parent.expression === orig && needs_unbinding(compressor, val);
+        } else if (parent instanceof AST_Template) {
+            wrap = parent.tag === orig && needs_unbinding(compressor, val);
         } else if (parent instanceof AST_UnaryPrefix) {
             wrap = parent.operator == "delete"
                 || parent.operator == "typeof" && is_undeclared_ref(val);

lib/output.js

@@ -746,6 +746,8 @@ function OutputStream(options) {
             || p instanceof AST_PropAccess && p.expression === this
             // ...(foo, bar, baz)
             || p instanceof AST_Spread
+            // (foo, bar)`baz`
+            || p instanceof AST_Template && p.tag === this
             // !(foo, bar, baz)
             || p instanceof AST_Unary
             // var a = (1, 2), b = a + a; ---> b == 4