Add ARM RTABI aliases for extendhfsf2 and truncsfhf2

[olista01]

Summary

The ARM RTABI defines these functions as aeabi_h2f and aeabi_f2h, so we need aliases for them,

[ab]

You should also define d2h.

[olista01]

Also add d2h alias.

[rengolin]

LGTM, thanks!

[olista01]

Thanks, committed as r249559.

lib/builtins/extendhfsf2.c

 //===-- lib/extendhfsf2.c - half -> single conversion -------------*- C -*-===//
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file is dual licensed under the MIT and the University of Illinois Open
 // Source Licenses. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 
 #define SRC_HALF
 #define DST_SINGLE
 #include "fp_extend_impl.inc"
 
+ARM_EABI_FNALIAS(h2f, extendhfsf2)
+
 // Use a forwarding definition and noinline to implement a poor man's alias,
 // as there isn't a good cross-platform way of defining one.
 COMPILER_RT_ABI __attribute__((noinline)) float __extendhfsf2(uint16_t a) {
     return __extendXfYf2__(a);
 }
 
 COMPILER_RT_ABI float __gnu_h2f_ieee(uint16_t a) {
     return __extendhfsf2(a);
 }

lib/builtins/truncdfhf2.c

 //===-- lib/truncdfhf2.c - double -> half conversion --------------*- C -*-===//
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file is dual licensed under the MIT and the University of Illinois Open
 // Source Licenses. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 
 #define SRC_DOUBLE
 #define DST_HALF
 #include "fp_trunc_impl.inc"
 
+ARM_EABI_FNALIAS(d2h, truncdfhf2)
+
 COMPILER_RT_ABI uint16_t __truncdfhf2(double a) {
     return __truncXfYf2__(a);
 }

lib/builtins/truncsfhf2.c

 //===-- lib/truncsfhf2.c - single -> half conversion --------------*- C -*-===//
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file is dual licensed under the MIT and the University of Illinois Open
 // Source Licenses. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 
 #define SRC_SINGLE
 #define DST_HALF
 #include "fp_trunc_impl.inc"
 
+ARM_EABI_FNALIAS(f2h, truncsfhf2)
+
 // Use a forwarding definition and noinline to implement a poor man's alias,
 // as there isn't a good cross-platform way of defining one.
 COMPILER_RT_ABI __attribute__((noinline)) uint16_t __truncsfhf2(float a) {
     return __truncXfYf2__(a);
 }
 
 COMPILER_RT_ABI uint16_t __gnu_f2h_ieee(float a) {
     return __truncsfhf2(a);
 }