unify the name convention of label in .S files

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@6195 6f19259b-4bc3-4df7-8a09-765794883524

MdePkg/Library/BaseMemoryLibRepStr/X64/CopyMem.S

@@ -44,20 +44,20 @@ ASM_PFX(InternalMemCopyMem):
     lea     r9, [rsi + r8 - 1]          # r9 <- End of Source
     cmp     rsi, rdi
     mov     rax, rdi                    # rax <- Destination as return value
-    jae     _InternalMemCopyMem_al_0000
+    jae     L0
     cmp     r9, rdi
-    jae     _atSym_CopyBackward               # Copy backward if overlapped
-_InternalMemCopyMem_al_0000:
+    jae     L_CopyBackward               # Copy backward if overlapped
+L0:
     mov     rcx, r8
     and     r8, 7
     shr     rcx, 3
     rep     movsq                       # Copy as many Qwords as possible
-    jmp     _atSym_CopyBytes
-_atSym_CopyBackward:
+    jmp     L_CopyBytes
+L_CopyBackward:
     mov     rsi, r9                     # rsi <- End of Source
     lea     rdi, [rdi + r8 - 1]         # esi <- End of Destination
     std                                 # set direction flag
-_atSym_CopyBytes:
+L_CopyBytes:
     mov     rcx, r8
     rep     movsb                       # Copy bytes backward
     cld