Be less aggressive when using AggressiveInlining in Vector.cs

Don't aggressive inline methods with more than 4 statements or methods
with loops or complex statements in them.
Be less aggressive whe using AggressiveInlining in Array.cs

Don't aggressive inline methods with more than 4 statements or methods
with loops or complex statements in them. Note that there ars still a
few MoveNext and Current methods that have more than 4 statements but
still include the AggressiveInlining attribute. I left them because
they're likely to be called often.
Be less aggressive when using AggressiveIlining in Dictionary.cs

Don't aggressive inline methods with more than 4 statements or methods
with loops or complex statements in them. Some MoveNext and Current
methods still have the AggressiveInlining attribute as they are likely
to be called often.