Windows arm64 mainline builds fail since mimalloc relanded

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Following up from #79115, mimalloc relanded and x86_64 builds are green. However, the arm64 mainline builds fail to link T:\arm64\mimalloc\bin\mimalloc.dll due to unresolved symbol __popcnt64.

It's referenced from T:\arm64\mimalloc\mimalloc-override-dll\bitmap.obj in function:

?mi_bbitmap_try_find_and_clear_generic@@YA_NPEAUmi_bbitmap_s@@_K1PEA_KP6A_NPEAUmi_bchunk_s@@12@Z@Z

Full link line and error message from https://ci-external.swift.org/job/swift-main-windows-toolchain-arm64/947/:

C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.39.33519\bin\HostX86\arm64\link.exe /ERRORREPORT:QUEUE /OUT:"T:\arm64\mimalloc\bin\mimalloc.dll" /NOLOGO "C:\Users\swift-ci\jenkins\workspace\swift-main-windows-toolchain-arm64\mimalloc\ide\vs2022\\..\..\bin\mimalloc-redirect-arm64.lib" kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /MANIFEST /MANIFESTUAC:"level='asInvoker' uiAccess='false'" /manifest:embed /DEBUG:FULL /PDB:"T:\arm64\mimalloc\bin\mimalloc.pdb" /OPT:REF /OPT:ICF /LTCGOUT:"T:\arm64\mimalloc\mimalloc-override-dll\mimalloc.iobj" /TLBID:1 /DYNAMICBASE /NXCOMPAT /IMPLIB:"T:\arm64\mimalloc\bin\mimalloc.lib" /MACHINE:ARM64 /DLL "T:\arm64\mimalloc\mimalloc-override-dll\alloc-aligned.obj"
         "T:\arm64\mimalloc\mimalloc-override-dll\alloc-posix.obj"
         "T:\arm64\mimalloc\mimalloc-override-dll\alloc.obj"
         "T:\arm64\mimalloc\mimalloc-override-dll\arena-meta.obj"
         "T:\arm64\mimalloc\mimalloc-override-dll\arena.obj"
         "T:\arm64\mimalloc\mimalloc-override-dll\bitmap.obj"
         "T:\arm64\mimalloc\mimalloc-override-dll\heap.obj"
         "T:\arm64\mimalloc\mimalloc-override-dll\init.obj"
         "T:\arm64\mimalloc\mimalloc-override-dll\libc.obj"
         "T:\arm64\mimalloc\mimalloc-override-dll\page-map.obj"
         "T:\arm64\mimalloc\mimalloc-override-dll\prim.obj"
         "T:\arm64\mimalloc\mimalloc-override-dll\options.obj"
         "T:\arm64\mimalloc\mimalloc-override-dll\os.obj"
         "T:\arm64\mimalloc\mimalloc-override-dll\page.obj"
         "T:\arm64\mimalloc\mimalloc-override-dll\random.obj"
         "T:\arm64\mimalloc\mimalloc-override-dll\stats.obj"
            Creating library T:\arm64\mimalloc\bin\mimalloc.lib and object T:\arm64\mimalloc\bin\mimalloc.exp
     1>bitmap.obj : error LNK2019: unresolved external symbol __popcnt64 referenced in function "bool __cdecl mi_bbitmap_try_find_and_clear_generic(struct mi_bbitmap_s *,unsigned __int64,unsigned __int64,unsigned __int64 *,bool (__cdecl*)(struct mi_bchunk_s *,unsigned __int64,unsigned __int64 *))" (?mi_bbitmap_try_find_and_clear_generic@@YA_NPEAUmi_bbitmap_s@@_K1PEA_KP6A_NPEAUmi_bchunk_s@@12@Z@Z) [C:\Users\swift-ci\jenkins\workspace\swift-main-windows-toolchain-arm64\mimalloc\ide\vs2022\mimalloc-override-dll.vcxproj]
     1>T:\arm64\mimalloc\bin\mimalloc.dll : fatal error LNK1120: 1 unresolved externals [C:\Users\swift-ci\jenkins\workspace\swift-main-windows-toolchain-arm64\mimalloc\ide\vs2022\mimalloc-override-dll.vcxproj]
     1>Done Building Project "C:\Users\swift-ci\jenkins\workspace\swift-main-windows-toolchain-arm64\mimalloc\ide\vs2022\mimalloc-override-dll.vcxproj" (default targets) -- FAILED.```

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Fixed with a Visual Studio upgrade from 14.39.33519 to 14.42.34433