MdeModulePkg DxeCore: Fix potential FV overflow of 4GB boundary on a 32-bit systems.

The traversing of a Memory Mapped FV can overflow the 4GB limit on a 32bit system during the setting up a Linked List of FFS file inside the FV.

(Sync patch r16527 from main trunk.)

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Star Zeng <star.zeng@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>

git-svn-id: svn://svn.code.sf.net/p/edk2/code/branches/UDK2014.SP1/MdeModulePkg@16528 6f19259b-4bc3-4df7-8a09-765794883524
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

(Sync patch r16529 from main trunk.)

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: svn://svn.code.sf.net/p/edk2/code/branches/UDK2014.SP1/MdeModulePkg@16532 6f19259b-4bc3-4df7-8a09-765794883524