Deal with cross-bitness compilation warnings Pt.2 (dotnet/coreclr#19781)

Deal with cross-bitness compilation warnings Pt.2 (dotnet/coreclr#19781)

* Disable ASMCONSTANTS_C_ASSERT in cross-bitness scenario in src/vm/ceeload.cpp

* Adjust MAXFIELDMARSHALERSIZE for cross-bitness scenario in src/vm/arm/cgencpu.h

* Make ALLOC_ALIGN_CONSTANT host specific in src/inc/stdmacros.h

* Make PRECODE_ALIGNMENT host specific in src/vm/arm/cgencpu.h

* Disable unreachable code in src/vm/arm/stubs.cpp

* Adjust CorDBIPC_BUFFER_SIZE for cross-bitness scenario in src/debug/inc/dbgipcevents.h

* Disable warning C4359 in src/vm/arm/cgencpu.h

* Deal with warning C4267: 'initializing': conversion from 'size_t' to 'int' in src/vm/stublink.cpp

* Deal with warning C4267: 'initializing': conversion from 'size_t' to 'int' in src/vm/callingconvention.h

* Disable unreachable REGDISPLAY constructor in src/inc/regdisp.h

Commit migrated from https://github.com/dotnet/coreclr/commit/b042edd2d3aab48fe9524381b8b445b910722d8d