Implement trigonometric functions using a fdlibm port.

test/test262/test262.status

Index: test/test262/test262.status
diff --git a/test/test262/test262.status b/test/test262/test262.status
index 18d65c4028cb8f0bcfdc24b3431696a76485480a..dd075d968853fa18fd5f97cf50e549bad692b680 100644
--- a/test/test262/test262.status
+++ b/test/test262/test262.status
@@ -68,14 +68,7 @@
 
   ##################### DELIBERATE INCOMPATIBILITIES #####################
 
-  # This tests precision of Math functions.  The implementation for those
-  # trigonometric functions are platform/compiler dependent.  Furthermore, the
-  # expectation values by far deviates from the actual result given by an
-  # arbitrary-precision calculator, making those tests partly bogus.
-  'S15.8.2.7_A7': [PASS, FAIL_OK],  # Math.cos
   'S15.8.2.8_A6': [PASS, FAIL_OK],  # Math.exp (less precise with --fast-math)
-  'S15.8.2.16_A7': [PASS, FAIL_OK],  # Math.sin
-  'S15.8.2.18_A7': [PASS, FAIL_OK],  # Math.tan
 
   # Linux for ia32 (and therefore simulators) default to extended 80 bit
   # floating point formats, so these tests checking 64-bit FP precision fail.