* std/bitops: Add explicit type masking for the JS target
Typecasts on the JavaScript backend do not function the same way as they
do on C and C++ backends, so for bitwise operations we may need to mask them
back down into their allowed range when they get shifted outside it.
Since they do work as expected on the other backends, a default bitmask
of all 1's is casted down into the target type as an easily optimizable
"& 0xFF" operation for these backends.
* Fixup: this should still be a func
* Run test case on js target
* Adapt testcase to contributor guide and best practices
* Simplify constrain logic and turn into actual no-op for the C side
* IC: renamed to_packed_ast module to ic module
* IC: don't store the --forceBuild flag, makes it easier to test
* IC: enable hello world test
* Codegen: refactorings for IC; changed the name mangling algorithm
* fixed the HCR regressions
* life is too short for HCR
* tconvexhull is now allowed to use deepCopy
* IC exposed a stdlib bug, required a refactoring
* codegen: code cleanups
* IC: even if a module is outdated, its dependencies might come from disk
* IC: progress
* IC: better name mangling, module IDs are not stable
* IC: another refactoring helping with --ic:on --gc:arc
* disable arraymancer on Windows for the time being
* disable arraymancer altogether
* IC: make basic test work with 'nim cpp'
* IC: progress on --ic:on --gc:arc
* wip; name mangling for type info
* I don't care about observable stores
* enforce explicit initializations
* cleaner code for the stdlib
* stdlib: use explicit initializations
* make tests green
* algorithm.nim: set result explicitly
* remove out parameters and bring the PR into a mergable state
* updated the changelog
* added bit operations based on bit slices, clarified documentation, made non-mutating versions of mask ops
* Added since annotations, some runnable examples
* Added mask()/masked() functions, changed internal workings of mask ops to use new bit* funcs
* Changelog updated for new bitops improvements
* Reorganization, added runnable examples
* Documentation adjustments
* Add incltrl for since annotation
* Fix masked() impl
* Fix mask() return type
* Don't call toUnsigned on already unsigned types
* Remove improper `var T` for flipMasked()
* Fix return types for flipMasked()
* Slight syntactic cleanup for *masked ops
* Added tests for bitslice operations, new mask() operation, non-mutating mask ops
* Fix setmasked() var T issue
* More comprehensive tests
* Fix runnable example for bitsliced()
* Fix runnable example for mask()
