Merge pull request #2524 from lambdageek/monoerror-mono_string_new_utf16_checked

[runtime] Use MonoError for mono_string_new_utf16

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

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

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

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

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

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

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

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

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

diff --cc mono/utils/mono-error-internals.h
Simple merge

diff --cc mono/utils/mono-error.c
Simple merge