Add quickjs-2021-03-27 to third_party

third_party/quickjs/Changelog

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+2021-03-27:
+
+- faster Array.prototype.push and Array.prototype.unshift
+- added JS_UpdateStackTop()
+- fixed Windows console
+- misc bug fixes
+
+2020-11-08:
+
+- improved function parameter initializers
+- added std.setenv(), std.unsetenv() and std.getenviron()
+- added JS_EvalThis()
+- misc bug fixes
+
+2020-09-06:
+
+- added logical assignment operators
+- added IsHTMLDDA support
+- faster for-of loops
+- os.Worker now takes a module filename as parameter
+- qjsc: added -D option to compile dynamically loaded modules or workers
+- misc bug fixes
+
+2020-07-05:
+
+- modified JS_GetPrototype() to return a live value
+- REPL: support unicode characters larger than 16 bits
+- added os.Worker
+- improved object serialization
+- added std.parseExtJSON
+- misc bug fixes
+
+2020-04-12:
+
+- added cross realm support
+- added AggregateError and Promise.any
+- added env, uid and gid options in os.exec()
+- misc bug fixes
+
+2020-03-16:
+
+- reworked error handling in std and os libraries: suppressed I/O
+  exceptions in std FILE functions and return a positive errno value
+  when it is explicit
+- output exception messages to stderr
+- added std.loadFile(), std.strerror(), std.FILE.prototype.tello()
+- added JS_GetRuntimeOpaque(), JS_SetRuntimeOpaque(), JS_NewUint32()
+- updated to Unicode 13.0.0
+- misc bug fixes
+
+2020-01-19:
+
+- keep CONFIG_BIGNUM in the makefile
+- added os.chdir()
+- qjs: added -I option
+- more memory checks in the bignum operations
+- modified operator overloading semantics to be closer to the TC39
+  proposal
+- suppressed "use bigint" mode. Simplified "use math" mode
+- BigDecimal: changed suffix from 'd' to 'm'
+- misc bug fixes
+
+2020-01-05:
+
+- always compile the bignum code. Added '--bignum' option to qjs.
+- added BigDecimal
+- added String.prototype.replaceAll
+- misc bug fixes
+
+2019-12-21:
+
+- added nullish coalescing operator (ES2020)
+- added optional chaining (ES2020)
+- removed recursions in garbage collector
+- test stack overflow in the parser
+- improved backtrace logic
+- added JS_SetHostPromiseRejectionTracker()
+- allow exotic constructors
+- improved c++ compatibility
+- misc bug fixes
+
+2019-10-27:
+
+- added example of C class in a module (examples/test_point.js)
+- added JS_GetTypedArrayBuffer()
+- misc bug fixes
+
+2019-09-18:
+
+- added os.exec and other system calls
+- exported JS_ValueToAtom()
+- qjsc: added 'qjsc_' prefix to the generated C identifiers
+- added cross-compilation support
+- misc bug fixes
+
+2019-09-01:
+
+- added globalThis
+- documented JS_EVAL_FLAG_COMPILE_ONLY
+- added import.meta.url and import.meta.main
+- added 'debugger' statement
+- misc bug fixes
+
+2019-08-18:
+
+- added os.realpath, os.getcwd, os.mkdir, os.stat, os.lstat,
+  os.readlink, os.readdir, os.utimes, std.popen
+- module autodetection
+- added import.meta
+- misc bug fixes
+
+2019-08-10:
+
+- added public class fields and private class fields, methods and
+  accessors (TC39 proposal)
+- changed JS_ToCStringLen() prototype
+- qjsc: handle '-' in module names and modules with the same filename
+- added std.urlGet
+- exported JS_GetOwnPropertyNames() and JS_GetOwnProperty()
+- exported some bigint C functions
+- added support for eshost in run-test262
+- misc bug fixes
+
+2019-07-28:
+
+- added dynamic import
+- added Promise.allSettled
+- added String.prototype.matchAll
+- added Object.fromEntries
+- reduced number of ticks in await
+- added BigInt support in Atomics
+- exported JS_NewPromiseCapability()
+- misc async function and async generator fixes
+- enabled hashbang support by default
+
+2019-07-21:
+
+- updated test262 tests
+- updated to Unicode version 12.1.0
+- fixed missing Date object in qjsc
+- fixed multi-context creation
+- misc ES2020 related fixes
+- simplified power and division operators in bignum extension
+- fixed several crash conditions
+
+2019-07-09:
+
+- first public release