ArmPkg: use unified asm syntax for CLANG

The CLANG assembler does not support the legacy, non-unified assembler syntax,
i.e., it does not support the reordering of the condition suffixes with the
increment/decrement before/after or byte/word suffixes, and it does not
recognize the 'empty descending' (ED) suffix at all. So move to the unified
syntax, and replace 'empty descending' with 'decrement after' or 'increment
before' as appropriate.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@19280 6f19259b-4bc3-4df7-8a09-765794883524

ArmPkg/Library/CompilerIntrinsicsLib/Arm/udivmoddi4.S

@@ -13,6 +13,7 @@
 #------------------------------------------------------------------------------
 
   .text
+  .syntax unified
   .align 2
   GCC_ASM_EXPORT(__udivmoddi4)
 
@@ -44,7 +45,7 @@ L8:
 L6:
   cmp  r6, #0
   movne  r1, #0
-  stmneia  r6, {r0-r1}
+  stmiane  r6, {r0-r1}
   b  L2
 L4:
   ldr  r1, [sp, #0]
@@ -88,7 +89,7 @@ L18:
   cmp  r6, #0
   movne  r4, r0
   andne  r5, ip, r3
-  stmneia  r6, {r4-r5}
+  stmiane  r6, {r4-r5}
 L24:
   rsb  r3, r2, #0
   and  r3, r2, r3
@@ -123,7 +124,7 @@ L12:
   andne  r3, r3, r0
   movne  r2, r3
   movne  r3, #0
-  stmneia  r6, {r2-r3}
+  stmiane  r6, {r2-r3}
 L34:
   cmp  r1, #1
   beq  L10
@@ -175,7 +176,7 @@ L30:
   bls  L37
 L48:
   cmp  r6, #0
-  stmneia  r6, {r10-r11}
+  stmiane  r6, {r10-r11}
   b  L2
 L37:
   rsb  r1, r3, #31
@@ -229,7 +230,7 @@ L40:
   cmp  r6, #0
   orr  r10, r0, ip
   mov  r11, r1
-  stmneia  r6, {r4-r5}
+  stmiane  r6, {r4-r5}
   b  L10
 L2:
   mov  r10, #0