Analyzer Improvement for IDE0059

Brief description: The following two variable declarations are equivalent and only vary based on coding style:

a? ret;

if(Condition){
  ret = new a(){ ... };
} else {
  ret = new a(){ ... };
}

AND

var ret = default(a?);

if(Condition){
  ret = new a(){ ... };
} else {
  ret = new a(){ ... };
}

Today, IDE0059 triggers if a variable is initialized with any value and then later reassigned. I suggest updating IDE0059 to trigger only if a variable is initialized to a non-default value and then later reassigned.

Languages applicable: C# any maybe VB.

Code example that the analyzer SHOULD report: Needlessly initializing to a non-default value.

Code example that the analyzer not report: See above