Merge pull request dotnet/coreclr#1560 from Priya91/longpath-test

Replace MAX_PATH with new defines in rest of coreclr.

Commit migrated from https://github.com/dotnet/coreclr/commit/8ff2389204d7c41b17eff0e9536267aea8d6496f

diff --cc src/coreclr/src/debug/daccess/dacdbiimpl.cpp
Simple merge

diff --cc src/coreclr/src/debug/di/shimprocess.cpp
Simple merge

diff --cc src/coreclr/src/gc/gc.cpp
Simple merge