[compiler-rt] change write order of frexpl & frexpf so it doesn't corrupt stack ids

This was fixed in the past for `frexp`, but was not made for `frexpl` & `frexpf` https://github.com/google/sanitizers/issues/321
This patch copies the fix over to `frexpl` because it caused `frexp_interceptor.cpp` test to fail on iPhone and `frexpf` for consistency.

rdar://79652161

Reviewed By: delcypher, vitalybuka

Differential Revision: https://reviews.llvm.org/D104948