Change table size for trigonometric functions.

Sunspider verifies floating point results to the last bit, so this is to
make sure that we return the expected result.

R=jkummerow@chromium.org
BUG=

Review URL: https://codereview.chromium.org/71123003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@17685 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/math.js

@@ -217,7 +217,7 @@ var InitTrigonometricFunctions;
 // Also define the initialization function that populates the lookup table
 // and then wires up the function definitions.
 function SetupTrigonometricFunctions() {
-  var samples = 2048;  // Table size.
+  var samples = 1800;  // Table size.
   var pi = 3.1415926535897932;
   var pi_half = pi / 2;
   var inverse_pi_half = 1 / pi_half;