More Jit-to-Interp entry point cleanup.

Only register entry points dispatched through [r6+#offset] in
JitToInterpEntries.

For ARM targets check the size of JitToInterpEntries explicitly to
make sure that its last entry is within 128 byte from InterpState
due to the Thumb codegen constraint.

Change-Id: I74184115cb3a3c89afc3a5fe53685671d9cb1027
6 files changed