Dominator analysis needs more testing

[cd1m0]

Add more samples for the dominate and dominateStmt relations in the analysis.spec.ts test. The samples should carefully test the exact ordering of operations in specific edge cases. Specifically pay attention to the following edge cases:

• ordering along modifier invocation
• constructors with a mixture of base invocations and modifier invocations
• ordering of binary operations (something like (uint x = (y = y + 2) - (y = y + 3)). Which branch executes first? Is it always the same for all binary operators or does it vary?
• What is the order of evalation of function agruments? (something like foo(y = y *2, y++, y += x)). Are they evaluated left to right or right to left?
• Does the callee expresion of a function call get evaluated before or after the arguments? (e.g. something like foo { val : y += 1 }(y))
• Does the base expression or index expression of a index access get evaluated first? . This is trickier to test. Perhaps something like: a[a.push(idx)]?
• Same question for IndexRangeAccess
• In FunctionCallOption, does the base expression get evaluated first, or the options? Again, this is tricier to test. Maybe something along the lines of a{gas: y++}{value: y++}()?
• What is the order of evaluation for tuple expressions? Something like (uint x, uint y, uint z) = (t++, t++, t++);