ArmPkg/CompilerIntrinsicesLib: Fixed memmove() and memset()

- Fixed memmove when going backward: the copy started one byte
  after the end of the region to copy
- memset: - removed unused register
          - fixed arguments size and character arguments were
            actually reversed
- Added memmove() to ARM32 GCC

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Olivier Martin <olivier.martin@arm.com>



git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@16328 6f19259b-4bc3-4df7-8a09-765794883524

ArmPkg/Library/CompilerIntrinsicsLib/CompilerIntrinsicsLib.inf

@@ -60,6 +60,7 @@
 
   Arm/memcpy.S     | GCC
   Arm/memset.S     | GCC
+  Arm/memmove.S    | GCC
 
 #  Arm/modsi3.c     | GCC
 #  Arm/moddi3.c     | GCC