Revert "[InferAttrs] Add writeonly to all the math functions"

This reverts commit ea75be3d9df448b6abafaf752a8141764d93ca33 and
1eb5b6e85045d22720f177a02aaf7097930e4b4f.

That commit caused crashes with compilation e.g. like this
(not fixed by the follow-up commit):

$ cat sqrt.c
float a;
b() { sqrt(a); }
$ clang -target x86_64-linux-gnu -c -O2 sqrt.c
Attributes 'readnone and writeonly' are incompatible!
  %sqrtf = tail call float @sqrtf(float %0) #1
in function b
fatal error: error in backend: Broken function found, compilation aborted!

0 files changed, 0 insertions, 0 deletions