Been almost a month since the code formatter was run so this change was
a bit larger than would be expected for a normal (weekly) update.  Diffs
mostly around:

- Whitespace changes
- Missing copyright headers
- Missing visibility modifiers

1) Change MethdCompiler.BindMethodBody to associate correct syntax with BoundBlocks it creates when binding constructor with constructor initializer call (two bound blocks are created – outer one defines a closure scope for constructor parameters, the inner one defines a closure scope for variables in the body).
2) Introduce MethodDebugId – a method ordinal and generation ordinal pair
3) Introduce LamdbaDebugInfo and ClosureDebugInfo to represent information (syntax offset) we use to figure out how to map lambdas and closures to the previous generation.
4) Adds a new PDB CDI record (#7) to store lambda and closure debug info.
5) Generalizes CalculateLocalSyntaxOffset to handle positions in field/property initializers and constructor initializers. Use it to calculate syntax offsets of lambdas and closure scopes. (TODO: rename CalculateLocalSyntaxOffset to CalculateSyntaxOffset).
6) Replace lambda and scope ordinal dispenser integers with array builders that collect LambdaDebugInfo and ClosureDebugInfo.
7) Use TryGet- pattern for all VariableSlotAllocator APIs.
8) Implements mapping of lambda method and display class names to previous generation via VariableSlotAllocator.
 (changeset 1407240)