A few places in Hotspot call to StubRoutines for math functions, see e.g. `LibraryCallKit::inline_math_native`:

```
bool LibraryCallKit::inline_math_native(vmIntrinsics::ID id) {
  switch (id) {
  case vmIntrinsics::_dsin:
    return StubRoutines::dsin() != nullptr ?
      runtime_math(OptoRuntime::Math_D_D_Type(), StubRoutines::dsin(), "dsin") :
      runtime_math(OptoRuntime::Math_D_D_Type(), CAST_FROM_FN_PTR(address, SharedRuntime::dsin), "SIN");
```

This might have been driven by the desire to avoid the expensive native calls to fdlibm. After fdlibm ports to Java (JDK-8134780, JDK-8171407), this might be unnecessary, and we could just stay in Java for these computations. This would likely eliminate the need for lots of platform-specific assembler coding for these math methods.