Cross-bitness in instance fields placement and CORINFO structs (dotnet/coreclr#18366)

Cross-bitness in instance fields placement and CORINFO structs (dotnet/coreclr#18366)

* Replace sizeof(OBJECTREF*) with TARGET_POINTER_SIZE

* Define IN_TARGET_32BIT IN_TARGET_64BIT macros

* Replace IN_WIN32 IN_WIN64 with IN_TARGET_32BIT IN_TARGET_64BIT in src/vm/jitinterface.cpp src/vm/methodtablebuilder.cpp

* Define and use OFFSETOF__CORINFO_* constants in clrjit

* Define for all 64-bit targets

* Use unsigned __int32 to emphasize that this is 32-bit number

* Rename Array__u1Elems to Array__data

* Eliminate OFFSETOF__CORINFO_RefArray__length

* Rename OFFSETOF__CORINFO_RefAny__ to OFFSETOF__CORINFO_TypedReference__

* Fix OFFSETOF__CORINFO_TypedReference__dataPtr macro value

Commit migrated from https://github.com/dotnet/coreclr/commit/c77ef768fc969d6875426e76e51485f2d67ac51c