Fixed GCC 4.4 build issue. Also fixed issue where upper 32-bits may be lost during AND operation.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@10376 6f19259b-4bc3-4df7-8a09-765794883524

MdePkg/Library/BaseLib/X64/DisablePaging64.S

@@ -43,7 +43,7 @@ ASM_PFX(InternalX86DisablePaging64):
     lea    _mTransitionEnd(%rip), %rax    # rax <- end of transition code
     sub    %rsi, %rax                     # rax <- The size of transition piece code
     add    $4, %rax                       # round rax up to the next 4 byte boundary
-    and    $0x0fffffffc, %rax
+    and    $0xfc, %al
     sub    %rax, %rdi                     # rdi <- use stack to hold transition code 
     mov    %edi, %r10d                    # r10 <- The start address of transicition code below 4G
     push   %rcx                           # save rcx to stack
@@ -78,4 +78,5 @@ L1:
     push   %rsi                           # push Context1
     callq  *%rbx                          # transfer control to EntryPoint
     jmp    .                              # no one should get here
-
_mTransitionEnd :
+
+_mTransitionEnd :

MdePkg/Library/BaseLib/X64/DisablePaging64.asm

@@ -41,7 +41,7 @@ InternalX86DisablePaging64    PROC
     lea     rax, mTransitionEnd         ; rax <- end of transition code
     sub     rax, rsi                    ; rax <- The size of transition piece code 
     add     rax, 4                      ; Round RAX up to the next 4 byte boundary
-    and     rax, 0fffffffch
+    and     al, 0fch
     sub     rdi, rax                    ; rdi <- Use stack to hold transition code
     mov     r10d, edi                   ; r10 <- The start address of transicition code below 4G
     push    rcx                         ; save rcx to stack