Allow arm64 to contain zero in GT_STORE_LCL_FLD
Allow arm64 to contain zero in GT_STORE_LCL_FLD

The codegen to handle this in codegenarm64.cpp, CodeGen::genCodeForStoreLclFld()
already exists.

mmitche/coreclr,wtgodbe/coreclr,mmitche/coreclr,krk/coreclr,wtgodbe/coreclr,cshung/coreclr,krk/coreclr,mmitche/coreclr,poizan42/coreclr,cshung/coreclr,poizan42/coreclr,cshung/coreclr,wtgodbe/coreclr,wtgodbe/coreclr,mmitche/coreclr,poizan42/coreclr,cshung/coreclr,mmitche/coreclr,krk/coreclr,krk/coreclr,krk/coreclr,cshung/coreclr,poizan42/coreclr,mmitche/coreclr,poizan42/coreclr,cshung/coreclr,krk/coreclr,wtgodbe/coreclr,wtgodbe/coreclr,poizan42/coreclr