Ask test use AVX2 when run on Windows.

src/tests/Interop/PInvoke/Generics/CMakeLists.txt

@@ -1,5 +1,5 @@
-project (GenericsNative) 
-include ("${CLR_INTEROP_TEST_ROOT}/Interop.cmake") 
+project (GenericsNative)
+include ("${CLR_INTEROP_TEST_ROOT}/Interop.cmake")
 if(CLR_CMAKE_TARGET_ARCH_I386)
   add_definitions(-DTARGET_X86)
   add_definitions(-DTARGET_XARCH)
@@ -17,10 +17,15 @@ if (CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
   # The ABI for passing parameters with 32-byte alignment has changed in GCC 4.6
   add_compile_options(-Wno-psabi)
 endif()
-if (NOT MSVC AND NOT CLR_CMAKE_TARGET_ARCH_ARM64 AND NOT CLR_CMAKE_TARGET_ARCH_ARM)
-  # We need -march=native so we can detect if AVX2 is present.
-  # ARM does not like that option too and it make no sense to have this detection there.
-  add_compile_options(-march=native)
+if (MSVC)
+  # The MSVC require explicitly ask for AVX2 so define would be present.
+  add_compile_options(/arch:AVX2)
+else()
+  if (NOT CLR_CMAKE_TARGET_ARCH_ARM64 AND NOT CLR_CMAKE_TARGET_ARCH_ARM)
+    # We need -march=native so we can detect if AVX2 is present.
+    # ARM does not like that option too and it make no sense to have this detection there.
+    add_compile_options(-march=native)
+  endif()
 endif()
 set(SOURCES
   GenericsNative.IUnknown.cpp
@@ -92,4 +97,4 @@ set(SOURCES
   GenericsNative.VectorU.cpp
 )
 add_library (GenericsNative SHARED ${SOURCES})
-install (TARGETS GenericsNative DESTINATION bin) 
+install (TARGETS GenericsNative DESTINATION bin)