x ~/ y should allow doubles in compile time constants

[floitschG]

Example of a program dartc rejects, but that should be allowed:
===
final x = 5.5;
final y = 2.2;
final z = x ~/ y;
main() => print(z);
===
file:bug.dart:3: Expected constant expression of type int, got double
     2: final y = 2.2;
     3: final z = x ~/ y;
Compilation failed with 1 problem.

[floitschG]

just opened issue #1781.

[floitschG]

correction: issue #1782

[kasperl]

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

[danrubel]

Added this to the M1 milestone.

[bwilkerson]

Set owner to @bwilkerson.
Added Started label.

[bwilkerson]

http://codereview.chromium.org/10535148/

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Added Fixed label.