Merge pull request #2670 from lambdageek/dev/monoerror-mono_runtime_object_init

[runtime] Use MonoError in mono_runtime_object_init

Mark mono_runtime_object_init checked external only.  Runtime should use mono_runtime_object_init_checked.

diff --cc mono/metadata/exception.c
Simple merge

diff --cc mono/metadata/locales.c
Simple merge

diff --cc mono/metadata/object-internals.h
Simple merge

diff --cc mono/metadata/object.c
Simple merge

diff --cc mono/metadata/object.h
Simple merge