Merge pull request #2721 from ludovic-henry/fix-mono_ms_ticks

[runtime] Fix potential overflow when using mono_msec_ticks

diff --cc mono/io-layer/processes.c
Simple merge

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

diff --cc mono/metadata/icall-def.h
Simple merge

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

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

diff --cc mono/metadata/threadpool-ms.c
Simple merge

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

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

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

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