Sprinkle the AggressiveInlining love in pscorlib/Vector.cs
Remove #ifdefs surrounding AggressiveInlining in pscorlib/Vector.cs
Add AggressiveInlining to small methods in pscorlib/Array.cs
Remove #ifdefs surrounding AggressiveInlining in pscorlib/Array.cs
Add AggressiveInlining to small methods in pscorlib/Dictionary.cs
Set Playscript projects to target .NET 4.5