add mouse enter/leave events
fix TOTAL_STACK usage; fixes #2837
fake register name for non-validating asm vars
Added coercive calls and tests.

This is the fix from the patch here:

https://github.com/johnmccutchan/ecmascript_simd/pull/54

and anticipates its acceptance upstream.
update docs, test
bump version
update list of mouse events
Merge pull request #2818 from Daft-Freak/mouse_events

add mouse enter/leave events
use f32 in other.test_simd
fix warning on EXPORTED_FUNCTIONS, and improve test
note on 64-bit ints in ccall/cwrap; #2823
Update documentation on the default state of --memory-init-file
1.25.0
update memory growth code, and ensure replace_memory is on the top in fastcomp
Update libcxx.
Provide a value for ELAST.
Bump emscripten version.
fix for empty file bug in idbfs
Merge pull request #2844 from waywardmonkeys/update-libcxx

Update libcxx
Fix a couple of warnings.