[PATCH] Builtin fadd variants folding implementation

[Tejas Joshi]

Hi.
This patch includes implementation of fadd, faddl, daddl functions.
The patch boostraps on x86_64-linux-gnu and passes regression tests.

Thanks,
Tejas

gcc/ChangeLog:

2019-09-11  Tejas Joshi  <tejasjoshi9673@gmail.com>

    * builtin-types.def: Define narrowing function types.
    * builtins.def: Define fadd variants builtin functions.
    * fold-const-call.c (fold_const_narrow_binary): New. Folding calls
    and conditions for standard arithmetic functions.
    (fold_const_call): Add case for fadd variants.

gcc/testsuite/ChangeLog:

2019-09-11  Tejas Joshi  <tejasjoshi9673@gmail.com>

    * gcc.dg/builtin-fadd-1.c: New test.
    * gcc.dg/builtin-fadd-2.c: New test.
    * gcc.dg/builtin-fadd-3.c: New test.
    * gcc.dg/builtin-fadd-4.c: New test.
    * gcc.dg/builtin-fadd-5.c: New test.
    * gcc.dg/builtin-fadd-6.c: New test.
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