Remove 'if()' branches from i64 add and subtract code.
Restore the overflow check to llvm_uadd_with_overflow_i64 to account for the case 0xFFFFFFFFFFFFFFFF + 0x0000000100000001 == 0x0000000100000000.
Improve test/cases/uadd_overflow_64_ta2.ll to check that the tricky addition case 0xFFFFFFFFFFFFFFFF + 0x0000000100000001 is handled correctly.
emscripten libcextra provides wmemset,wmemcpy.
disable s_x_x in test_libcextra
Persist return value for wrapped functions
Don't list internal / undefined symbols.
auto-generate library stubs that abort for missing library functions, and implement DEAD_FUNCTIONS that way
update tests
fix and simplify a few str* asm library functions
Remove unneeded >>> 0 in llvm_uadd_with_overflow_i64.
Added self to AUTHORS
warn on missing functions
avoid warning on llvm_dbg_declare
Merge pull request #1088 from juj/branchless_i64_ops

Remove 'if()' branches from i64 add and subtract code.
Merge pull request #1090 from inolen/incoming

Persist return value for wrapped functions
simplify i64Add|Substract coercions
fix asm validation of llvm_uadd_with_overflow_i64
Merge pull request #1091 from waywardmonkeys/fix-libcextra-symbols

Don't list internal / undefined symbols.
Merge pull request #1089 from waywardmonkeys/remove-wchar-embind

emscripten libcextra provides wmemset,wmemcpy.