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/CompilerIntrinsicsLib.inf

@@ -23,8 +23,12 @@
   LIBRARY_CLASS                  = CompilerIntrinsicsLib
 
 [Sources]
-  memcpy.c
-  memset.c
+  memcpy.c             | RVCT
+  memcpy.c             | GCC
+  memcpy_ms.c          | MSFT
+  memset.c             | RVCT
+  memset.c             | GCC
+  memset_ms.c          | MSFT
 
 [Sources.ARM]
   Arm/mullu.asm        | RVCT
@@ -94,6 +98,10 @@
   Arm/llsr.S       | GCC
   Arm/llsl.S       | GCC
 
+  Arm/div.asm      | MSFT
+  Arm/uldiv.asm    | MSFT
+  Arm/ldivmod.asm  | MSFT
+  Arm/llsr.asm     | MSFT
 
 [Packages]
   MdePkg/MdePkg.dec
@@ -101,3 +109,7 @@
 
 [LibraryClasses]
 
+[BuildOptions]
+  MSFT:*_*_ARM_CC_FLAGS = /GL-
+  MSFT:*_*_ARM_ASM_FLAGS = /oldit
+  MSFT:*_*_AARCH64_CC_FLAGS = /GL-