Remove needless call to Array.prototype.slice.call. NFC (#17649)

Author: sbc100

src/library_exceptions.js

@@ -353,7 +353,6 @@ var LibraryExceptions = {
       setTempRet0(0);
       return thrown;
     }
-    var typeArray = Array.prototype.slice.call(arguments);
 
     // can_catch receives a **, add indirection
 #if EXCEPTION_DEBUG
@@ -363,8 +362,8 @@ var LibraryExceptions = {
     // Due to inheritance, those types may not precisely match the
     // type of the thrown object. Find one which matches, and
     // return the type of the catch block which should be called.
-    for (var i = 0; i < typeArray.length; i++) {
-      var caughtType = typeArray[i];
+    for (var i = 0; i < arguments.length; i++) {
+      var caughtType = arguments[i];
       if (caughtType === 0 || caughtType === thrownType) {
         // Catch all clause matched or exactly the same type is caught
         break;

src/library_path.js

@@ -73,7 +73,7 @@ mergeInto(LibraryManager.library, {
       return path.substr(lastSlash+1);
     },
     join: function() {
-      var paths = Array.prototype.slice.call(arguments, 0);
+      var paths = Array.prototype.slice.call(arguments);
       return PATH.normalize(paths.join('/'));
     },
     join2: (l, r) => {

test/other/metadce/test_metadce_cxx_except.jssize

@@ -1 +1 @@
-31508
+31460

test/other/metadce/test_metadce_cxx_mangle.jssize

@@ -1 +1 @@
-31608
+31560