math: Don't redirect inlined builtin math functions

math: Don't redirect inlined builtin math functions

When we want to inline builtin math functions, like truncf, for

  extern float truncf (float __x) __attribute__ ((__nothrow__ )) __attribute__ ((__const__));
  extern float __truncf (float __x) __attribute__ ((__nothrow__ )) __attribute__ ((__const__));

  float (truncf) (float) asm ("__truncf");

compiler may redirect truncf calls to __truncf, instead of inlining it
(for instance, clang).  The USE_TRUNCF_BUILTIN is 1 to indicate that
truncf should be inlined.  In this case, we don't want the truncf
redirection:

  1. For each math function which may be inlined, we define

  #if USE_TRUNCF_BUILTIN
   # define NO_truncf_BUILTIN inline_truncf
   #else
   # define NO_truncf_BUILTIN truncf
   #endif

in <math-use-builtins.h>.

  2. Include <math-use-builtins.h> in include/math.h.

  3. Change MATH_REDIRECT to

   #define MATH_REDIRECT(FUNC, PREFIX, ARGS)		\
    float (NO_ ## FUNC ## f ## _BUILTIN) (ARGS (float))	\
      asm (PREFIX #FUNC "f");

With this change If USE_TRUNCF_BUILTIN is 0, we get

  float (truncf) (float) asm ("__truncf");
  truncf will be redirected to __truncf.

And for USE_TRUNCF_BUILTIN 1, we get:

  float (inline_truncf) (float) asm ("__truncf");

In both cases either truncf will be inlined or the internal alias
(__truncf) will be called.

It is not required for all math-use-builtin symbol, only the one
defined in math.h.  It also allows to remove all the math-use-builtin
inclusion, since it is now implicitly included by math.h.

For MIPS, some math-use-builtin headers include sysdep.h and this
in turn includes a lot of extra headers that do not allow ldbl-128
code to override alias definition (math.h will include
some stdlib.h definition).  The math-use-builtin only requires
the __mips_isa_rev, so move the defintion to sgidefs.h.

Signed-off-by: H.J. Lu <hjl.tools@gmail.com>
Co-authored-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
Reviewed-by: H.J. Lu <hjl.tools@gmail.com>