MdePkg/BaseSynchronizationLib: Add InterlockedCompareExchange16

This implements the function InterlockedCompareExchange16 () for all
architectures, using architecture and toolchain specific intrinsics
or primitive assembler instructions.

Contributed-under: TianoCore Contribution Agreement 1.0
Reviewed-by: Olivier Martin <olivier.martin@arm.com>
Acked-by: Jordan Justen <jordan.l.justen@intel.com>
Reviewed-by: Michael Kinney <michael.d.kinney@intel.com>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Laszlo Ersek <lersek@redhat.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@16966 6f19259b-4bc3-4df7-8a09-765794883524

MdePkg/Library/BaseSynchronizationLib/BaseSynchronizationLib.inf

@@ -32,12 +32,14 @@
 [Sources.IA32]
   Ia32/InterlockedCompareExchange64.c | MSFT 
   Ia32/InterlockedCompareExchange32.c | MSFT 
+  Ia32/InterlockedCompareExchange16.c | MSFT
   Ia32/InterlockedDecrement.c | MSFT 
   Ia32/InterlockedIncrement.c | MSFT 
   SynchronizationMsc.c  | MSFT
 
   Ia32/InterlockedCompareExchange64.asm | INTEL 
   Ia32/InterlockedCompareExchange32.asm | INTEL 
+  Ia32/InterlockedCompareExchange16.asm | INTEL
   Ia32/InterlockedDecrement.asm | INTEL 
   Ia32/InterlockedIncrement.asm | INTEL 
   Synchronization.c | INTEL
@@ -48,9 +50,11 @@
 [Sources.X64]
   X64/InterlockedCompareExchange64.c | MSFT
   X64/InterlockedCompareExchange32.c | MSFT
+  X64/InterlockedCompareExchange16.c | MSFT
   
   X64/InterlockedCompareExchange64.asm | INTEL
   X64/InterlockedCompareExchange32.asm | INTEL
+  X64/InterlockedCompareExchange16.asm | INTEL
   
   X64/InterlockedDecrement.c | MSFT 
   X64/InterlockedIncrement.c | MSFT 
@@ -67,6 +71,7 @@
   Ipf/Synchronization.c
   Ipf/InterlockedCompareExchange64.s
   Ipf/InterlockedCompareExchange32.s
+  Ipf/InterlockedCompareExchange16.s
 
   Synchronization.c     | INTEL 
   SynchronizationMsc.c  | MSFT