assert should be usable as an identifier

[DartBot]

This issue was originally filed by [email protected]

---

dartc fails test Language/11_Statements/15_Assert_A05_t01.dart

assert() is a built in identifier (pseudokeyword) so you can re-define it
if you like, but the parser is insisting on a single argument method.

dartc /home/zundel/dart/tests/co19/src/Language/11_Statements/15_Assert_A05_t01.dart
file:/home/zundel/dart/tests/co19/src/Language/11_Statements/15_Assert_A05_t01.dart:69: Unexpected token ','
    68: flag = false;
    69: assert("it", "works!");
file:/home/zundel/dart/tests/co19/src/Language/11_Statements/15_Assert_A05_t01.dart:81: Unexpected token ','
    80: flag = false;
    81: assert(true, false, true);
Compilation failed with 2 problems.

[kasperl]

Removed Area-Compiler label.
Added Area-Analyzer label.

[danrubel]

Added this to the M1 milestone.

[scheglov]

Set owner to @scheglov.
Added Duplicate label.
Marked as being merged into #3268.