Fix Math.log10 implementation for 1 - Number.EPSILON.

test/mjsunit/es6/math-log2-log10.js

Index: test/mjsunit/es6/math-log2-log10.js
diff --git a/test/mjsunit/es6/math-log2-log10.js b/test/mjsunit/es6/math-log2-log10.js
index fa3f46807a10169ec36b99297ae24cf0fd080e1c..b1a7736d7152d8fe402df2072b077aa87739d84e 100644
--- a/test/mjsunit/es6/math-log2-log10.js
+++ b/test/mjsunit/es6/math-log2-log10.js
@@ -50,6 +50,9 @@ for (var i = -310; i <= 308; i += 0.5) {
 // Test denormals.
 assertEquals(-307.77759430519706, Math.log10(1.5 * Math.pow(2, -1023)));
 
+// Issue 4025.  Remove delta once issue 4029 has been fixed.
+assertEqualsDelta(-9.643274665532873e-17, Math.log10(1-Number.EPSILON), 3e-32);
+
 // Test Math.log2(2^k) for -1074 <= k <= 1023.
 var n = -1074;
 // This loop covers n from -1074 to -1043