This version contains a copy of a net.starlark.java from bazel
repository (revision fbbac6b295b9ef0ea1999dc3ae9df29eceffbe88).

These is incomplete list of changes applied to upstream.  The list
exists here to simplify sync with upstream if we ever do it.

* D26898614 Override contains for Tuple and StarlarkList
* D26877120 Special case for checkHashable
* D26877124 Faster kwargs population in StarlarkFunction
* D26877119 Faster stmt/expr switch in the interpreter
* D26877122 Make universe indexed
* D26877127 Reuse locals array in StarlarkFunction.processArgs
* D26877125 Speed-up StarlarkThread.push
* D26877123 Cache semantics-independent method descriptors
* D26877126 Reuse positional array in native calls where possible
* D26877128 Faster parameter type check for Object
* D26877129 Faster dict.keys
* D26877121 Intern identifiers
* D26877118 @StarlarkMethod.trustReturnsValid
* D26898616 Increase Printer default capacity
* D26919013 Remove unused StarlarkThread parameters
* D26920116 Slightly faster str.join
* D26934597 Slightly faster Printer.escapeCharacter
* D26968994 Convert ScriptTest to junit parameterized test
* D27032300 Faster Starlark.toIterable
* D26911948 Bytecode interpreter