Fix Maximum call stack size exception in computeLabelSizes (#7883)

Calling Math.max with a large number of values was throwing an exception.
Tracking the current largest width and height as the widths and heights are
built up should be faster and avoids the exception.

src/core/core.scale.js

@@ -130,6 +130,8 @@ function computeLabelSizes(ctx, tickFonts, ticks, caches) {
 	var widths = [];
 	var heights = [];
 	var offsets = [];
+	var widestLabelSize = 0;
+	var highestLabelSize = 0;
 	var i, j, jlen, label, tickFont, fontString, cache, lineHeight, width, height, nestedLabel, widest, highest;
 
 	for (i = 0; i < length; ++i) {
@@ -157,11 +159,13 @@ function computeLabelSizes(ctx, tickFonts, ticks, caches) {
 		widths.push(width);
 		heights.push(height);
 		offsets.push(lineHeight / 2);
+		widestLabelSize = Math.max(width, widestLabelSize);
+		highestLabelSize = Math.max(height, highestLabelSize);
 	}
 	garbageCollect(caches, length);
 
-	widest = widths.indexOf(Math.max.apply(null, widths));
-	highest = heights.indexOf(Math.max.apply(null, heights));
+	widest = widths.indexOf(widestLabelSize);
+	highest = heights.indexOf(highestLabelSize);
 
 	function valueAt(idx) {
 		return {