[libm] Avoid left shift of signed integer entitiesHEADmain

Follow-up commit d180086e6eae by fixing the left shift of signed integer
entities through the use of a helper function. Specific per file changes
are:

* lib/msun/src/e_fmodf.c:
* lib/msun/src/s_remquof.c:
  . Eliminate now unused variable 'i'.
  . Sort declaration statement.
  . Use subnormal_ilogbf() to avoid left shift of signed integer.

* lib/msun/src/math_private.h b/lib/msun/src/math_private.h:
  . Implement subnormal_ilogbf() to extract an exponent of a subnormal
    float.  This avoids left shifts of signed integers.
  . Update nearby comment.

* lib/msun/src/s_ilogbf.c
  . Fix declaration of the function statement in accordance with style(9).
  . Use subnormal_ilogbf() to avoid left shift of signed integer.

PR:		288850
MFC after:	1 week

0 files changed, 0 insertions, 0 deletions