MdeModulePkg DebugSupportDxe: Fix build error with GNU assembler

The GNU assembler (2.24.51.20140918) is failing to build when movw is used on this instruction. 
Instead use the mov instruction, which matches the other cases of loading segment registers.

The error message seen is:
  AsmFuncs.iii:283: Error: incorrect register `%rax' used with `w' suffix

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jordan Justen <jordan.l.justen@intel.com>
Reviewed-by: Jeff Fan <jeff.fan@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@16529 6f19259b-4bc3-4df7-8a09-765794883524
UefiCpuPkg CpuExceptionHandlerLib: Use %rax instead of %eax to make code consistence.

Make code consistence between ASM and S files.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jeff Fan <jeff.fan@intel.com>
Reviewed-by: Feng Tian <feng.tian@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@16530 6f19259b-4bc3-4df7-8a09-765794883524
SourceLevelDebugPkg DebugAgentLib: Fix build error with GNU assembler

Use mov instead of movw.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jeff Fan <jeff.fan@intel.com>
Reviewed-by: Feng Tian <feng.tian@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@16531 6f19259b-4bc3-4df7-8a09-765794883524