Add tests for StaticArray (AssemblyScript#1728)

Adds the following missing tests for StaticArray:
- constructor
- fromArray
- concat (static)
- slice (sstatic)
- concat (instance)
- includes
- indexOF
- join + toString

Correct typo in float JS glue (AssemblyScript#1720)

Add tests for TypedArray#sort (AssemblyScript#1710)

fix: Invert reference type null check in makeIsTrueish (AssemblyScrip…

…t#1719)

fix: Fix temp. local confusion in indexed assignment compilation (Ass…

…emblyScript#1703)

feat: Slightly optimize shadow stack pass (AssemblyScript#1667)

feat: Make use of initial memory when initializing incremental GC (As…

…semblyScript#1692)

fix: Ensure exported field getters and setters are compiled (Assembly…

…Script#1683)

fix: Update Rtrace definitions (AssemblyScript#1681)

fix: Emit a diagnostic when 'super' is used in a non-derived class (A…

…ssemblyScript#1678)