ArmPkg/Library/CompilerIntrinsicsLib: Enable VS2017/ARM builds

Introduce CRT assembly replacements for __rt_sdiv, __rt_udiv,
__rt_udiv64, __rt_sdiv64, __rt_srsh (by reusing the RVCT code)
as well as memcpy and memset.
For MSFT compatibility, some of the code needs to be explicitly
forced to ARM, and the /oldit assembly flag needs to be added.
Also, while RVCT_ASM_EXPORT macro invocations have been removed,
the replacement code is designed to be as close as possible to
the one that would have been generated if using the macros.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Pete Batard <pete@akeo.ie>
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>

ArmPkg/Library/CompilerIntrinsicsLib/Arm/llsr.asm

@@ -1,6 +1,7 @@
 //------------------------------------------------------------------------------
 //
 // Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
+// Copyright (c) 2018, Pete Batard. All rights reserved.<BR>
 //
 // This program and the accompanying materials
 // are licensed and made available under the terms and conditions of the BSD License
@@ -12,32 +13,33 @@
 //
 //------------------------------------------------------------------------------
 
+  EXPORT  __aeabi_llsr
+  EXPORT  __rt_srsh
 
+  AREA  s___aeabi_llsr, CODE, READONLY, ARM
 
-    INCLUDE AsmMacroExport.inc
+  ARM
 
 ;
 ;VOID
 ;EFIAPI
 ;__aeabi_llsr (
-; IN  VOID    *Destination,
-; IN  VOID    *Source,
-; IN  UINT32  Size
-; );
+;  IN  UINT64  Value,
+;  IN  UINT32  Shift
+;)
 ;
- RVCT_ASM_EXPORT __aeabi_llsr
+__aeabi_llsr
+__rt_srsh
     SUBS     r3,r2,#0x20
-    BPL      {pc} + 0x18  ; 0x1c
+    BPL      __aeabi_llsr_label1
     RSB      r3,r2,#0x20
     LSR      r0,r0,r2
     ORR      r0,r0,r1,LSL r3
     LSR      r1,r1,r2
     BX       lr
+__aeabi_llsr_label1
     LSR      r0,r1,r3
     MOV      r1,#0
     BX       lr
 
     END
-
-
-