[PATCH] msvcrt: Call cdecl functions with empty FPU stack in _CI* functions

[Piotr Caban]

The FPU stack should be empty on cdecl function call. Failing to do so
breaks GCC 6.4.0 -O2 optimized code.

New code is still calling cdecl functions with non empty FPU stack.
Is it better to reimplement _CI* functions in assembler?

For bug #43940.

Signed-off-by: Piotr Caban <piotr(a)codeweavers.com>
---
  dlls/msvcrt/math.c | 123 
++++++++++++++++++++++++++++++-----------------------
  1 file changed, 69 insertions(+), 54 deletions(-)