StdLib: Patches and updates for ARM.

Add ARMGCC and RVCT toolchain support.
Update and Add ARM specific machine headers.
Set the empty macro for __warn_references().
Make __flt_rounds() return 'Round to nearest' by default on ARM.

Signed-off-by:  Olivier Martin [olivier.martin@arm.com]
Reviewed-by:    darylm503


git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@12367 6f19259b-4bc3-4df7-8a09-765794883524

StdLib/Include/Arm/machine/bswap.h

@@ -0,0 +1,11 @@
+/*      $NetBSD: bswap.h,v 1.4 2006/01/31 07:49:18 dsl Exp $      */
+
+#ifndef _MACHINE_BSWAP_H_
+#define _MACHINE_BSWAP_H_
+
+#include <machine/byte_swap.h>
+
+#define __BSWAP_RENAME
+#include <sys/bswap.h>
+
+#endif /* !_MACHINE_BSWAP_H_ */