Reverting System.Collections.Immutable back to 1.1.36 until we can upgrade System.Reflection.Metadata simultaneously

Updating Microsoft.DiaSymReader to v1.0.6, Microsoft.DiaSymReader.Native to v1.2.0, and System.Collections.Immutable to v1.1.37

Fixes #5631.

Fixes #5697.

Gracefully handle format exception from Diagnostic.GetMessage() when the analyzer reports a diagnostic with incorrect format arguments.

Fixes #4589

1. Fixes #5463: VB field and property declarations don't include the "AsClauseSyntax" node in the node's "Initializer" field, which caused us to miss executing the syntax node actions for AsNewClauseSyntax nodes within code blocks. Now we explicitly account for these initializer nodes.

2. Fixes #4745: C# namespace symbols defined by a qualified name such as "X.Y.Z" within "namespace X.Y.Z {}", all have the same declaring syntax reference. So we need to ensure that we don't make duplicate syntax node callbacks for such namespace declaration nodes.

Avoid rebinding references bound to explicitly specified definitions, even if a better version is available after resolution

Analyzer driver needs to cache some per-compilation data across analyzer diagnostic requests from the IDE. Currently we cache this data using a conditional weak table keyed by the compilation. However, we don't really need the old data once we move to analyzing a new compilation, so we can just use a weak reference.

Disabling flaky tests from http://dotnet-ci.cloudapp.net/job/roslyn-internal_master_win_rel_unit32/7/

Fixes #5516

Fixes #5363.

Look at the usings for each submission as we visit that submission.  The
mental model is a chain of ```InContainerBinder```s, but we don't actually
instantiate the chain for perf reasons.

TODO: Some tests are failing because of the new semantics.  The main issue
is that usings can now hide members (not just types).  No corresponding
issue exists in C# because usings can't appear within types.

Fixes #5395.

Adjusted Binder, Optimizer, Flow Analysis, code generator and majority of bound tree visitors to not use recursion to handle binary expressions nested on the left side of another binary expression.
Adjusted majority of bound tree visitors to detect that stack overflow is about to happen while an expression is being traversed and report a diagnostic pointing to the expression at fault instead of crashing compiler.

This change removes the compiler server test dependency on csc2 and
vbc2.  These binaries don't exist in all environments where we run these
unit tests as they are no longer a part of the shipping product.
Instead I replaced all uses with csc / vbc and explicitly passed the
shared flag to the compiler.

closes #5550
closes #5557

Old compiler did not insert casts for interface peoperty accesses on generic receiver when receiver was constrained to be a class.

When emitting a lambda method that binds to a delegate with dynamic
parameters, emit the dynamic attribute in the corresponding parameter
locations. This facilitates debugging of the lambda as parameters will
properly light up as dynamic in expression evaluation.

close #4160