[CMake] Update C4324 MSVC warning comment to explain its still broken at VS2019

As promised, I've updated the comment for the C4324 MSVC warning that was re-disabled at rL367409 / rG8f823e63e3edf87ab029ba32b68f3eb5d2f392b5 to put it in terms of currently supported VS versions

llvm-svn: 369368

diff --git a/llvm/cmake/modules/HandleLLVMOptions.cmake b/llvm/cmake/modules/HandleLLVMOptions.cmake
index f6dafc1..e55bcab 100644 (file)
--- a/llvm/cmake/modules/HandleLLVMOptions.cmake
+++ b/llvm/cmake/modules/HandleLLVMOptions.cmake
@@ -543,12 +543,10 @@ if (MSVC)
           # is fixed.
       -wd4709 # Suppress comma operator within array index expression
 
-      # Ideally, we'd like this warning to be enabled, but MSVC 2013 doesn't
+      # Ideally, we'd like this warning to be enabled, but even MSVC 2019 doesn't
       # support the 'aligned' attribute in the way that clang sources requires (for
       # any code that uses the LLVM_ALIGNAS macro), so this is must be disabled to
       # avoid unwanted alignment warnings.
-      # When we switch to requiring a version of MSVC that supports the 'alignas'
-      # specifier (MSVC 2015?) this warning can be re-enabled.
       -wd4324 # Suppress 'structure was padded due to __declspec(align())'
 
       # Promoted warnings.