Remove unused trigonometric code.

src/heap-inl.h

Index: src/heap-inl.h
diff --git a/src/heap-inl.h b/src/heap-inl.h
index 525c634da626809c7c1bdfa3ce70b512e8eca621..3229aeecc3096fa74bc9f022616eb277b4e79d58 100644
--- a/src/heap-inl.h
+++ b/src/heap-inl.h
@@ -763,23 +763,10 @@ Address TranscendentalCache::cache_array_address() {
 
 double TranscendentalCache::SubCache::Calculate(double input) {
   switch (type_) {
-    case ACOS:
-      return acos(input);
-    case ASIN:
-      return asin(input);
-    case ATAN:
-      return atan(input);
-    case COS:
-      return fast_cos(input);
-    case EXP:
-      return exp(input);
     case LOG:
       return fast_log(input);
-    case SIN:
-      return fast_sin(input);
-    case TAN:
-      return fast_tan(input);
     default:
+      UNREACHABLE();
       return 0.0;  // Never happens.
   }
 }