Fix constant in Math.tan implementation.

src/third_party/fdlibm/fdlibm.js

Index: src/third_party/fdlibm/fdlibm.js
diff --git a/src/third_party/fdlibm/fdlibm.js b/src/third_party/fdlibm/fdlibm.js
index 08c6f5e7207112ac80c5f420f98990e56b7468b0..b52f1de2693feb84f2f39cc9a180db73210ca1cd 100644
--- a/src/third_party/fdlibm/fdlibm.js
+++ b/src/third_party/fdlibm/fdlibm.js
@@ -267,7 +267,7 @@ function KernelTan(x, y, returnTan) {
       }
     }
   }
-  if (ix >= 0x3fe59429) {  // |x| > .6744
+  if (ix >= 0x3fe59428) {  // |x| > .6744

[Raymond Toy, 2014/11/04 16:49:52]

Sorry about the typo!

More tests should be added for each of the functions wherever there is a branch
is taken. I think there are tests for each branch, but not at the branch values.

     if (x < 0) {
       x = -x;
       y = -y;