1. Add a generic hashmap implementation.
2. Change Error `JSObject.is_uncatchable_error` flag to `JSObject.u.error` struct, leaving room for weak ref flag bit.
3. Compat `JSString.hash_next` to 31-bits (can be safely compat to 28-bits), leaving room for weak ref flag bit.
Save memory for each JSObject (8 bytes on 64-bit platform, 4 bytes on 32-bit platform).
- accept many more alternative date/time formats
- add test cases in tests/test_builtin.js
- match month and timezone names case insensitively
- accept AM and PM markers
- recognize US timezone names
- skip parenthesized stuff
- fix almost all v8 test cases
- rewrite Date.parse() with separate parsers
- return `NaN` for out of bounds field values as specified
- accept up to 9 decimals for millisecond fraction but truncate at 3
- accept many more alternative date/time formats
- add test cases in tests/test_builtin.js
- use `double` arithmetic where necessary to match the spec
- use `volatile` to ensure correct order of evaluation
and prevent FMA code generation
- reject some border cases.
- avoid undefined behavior in `double` -> `int64_t` conversions
- improved tests/test_builtin.js `assert` function to compare
values more reliably.
- added some tests in `test_date()`
- disable some of these tests on win32 and cygwin targets
- split test_bigfloat.js from test_bignum.js
- make test_date() compatible with node
- document Date constructor string argument format:
should add test cases for invalid strings
- test_argument_scope(): only test this syntax error in strict mode:
`var f = function(a = eval("var arguments")) {};`
- Use uint32_t arithmetics and Standard conformant conversion to
avoid UB in js_math_imul.
- add builtin tests
- use specific object directories for SAN targets
