Merge pull request #1150 from ludovic-henry/pr17c-delegate-trampoline

[delegate] Improve trampoline caching

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

diff --cc mono/mini/method-to-ir.c
Simple merge

diff --cc mono/mini/mini-trampolines.c
Simple merge

diff --cc mono/mini/mini.c
Simple merge

diff --cc mono/mini/mini.h
Simple merge