Move abi bits to separate header. Force AAPCS for EABI in accordance with ARM RTABI.

llvm-svn: 129769
diff --git a/compiler-rt/lib/powisf2.c b/compiler-rt/lib/powisf2.c
index c834b96..e6b43b3 100644
--- a/compiler-rt/lib/powisf2.c
+++ b/compiler-rt/lib/powisf2.c
@@ -11,12 +11,13 @@
  *
  * ===----------------------------------------------------------------------===
  */
+#include "abi.h"
 
 #include "int_lib.h"
 
 /* Returns: a ^ b */
 
-float
+COMPILER_RT_ABI float
 __powisf2(float a, si_int b)
 {
     const int recip = b < 0;