Document jumpStub usage in Codeman.cpp

Document jumpStub usage in Codeman.cpp
Added new STRESS_LOG calls that do the following:
 logging for JumpStubs
      log the total count of jump stub lookups: JumpStubLookup
      log the number of actual jump stub thunks created: JumpStubUnique
      log the number of jump stub blocks allocated: JumpStubBlockAllocCount
      log the number jump stub blocks that are completely filled: JumpStubBlockFullCount
 logging for ClrVirtualAllocWithinRange
      log the total number of calls to ClrVirtualAllocWithinRange
      log the number of VirtualQuery operations used by the current call
      log the range that was requested
      log the return value
      log any reasons for failure.

Commit migrated from https://github.com/dotnet/coreclr/commit/1da14f92116332b22dd6f0e6964625e39604c469