Fix reflection object equality comparisons.

[anpete]

Using '==' to compare reflection objects can fail on some platforms that haven't implemented the operator. I.e. .NET Native.

[anpete]

Risk: Very low, moving from '==' to calling the Equals method for reflection object comparisons is essentially a no-op on most platforms because the operator simply delegates to the method anyway.
Impact: High on .NET Native. Enables EF's internal caches to operate correctly on .NET Native.

[divega]

Reopening to go through approval process.

[Eilon]

This patch bug is approved. Please use the normal code review process w/ a PR and make sure the fix is in the correct branch, then close the bug and mark it as done.