Implement bigint mulAdd and sqrAdd intrinsics on ARM.
Add support for umaal instruction on ARM (assembler, disassembler, simulator).
Add assembler test for umaal instruction on ARM.

R=johnmccutchan@google.com, zra@google.com

Review URL: https://codereview.chromium.org//638983002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@40993 260f80e4-7a28-3924-810f-c04153c831b5
Fix expected value in arm assembler test.

Review URL: https://codereview.chromium.org//639973002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@40994 260f80e4-7a28-3924-810f-c04153c831b5
more common code completion tests

BUG=
R=scheglov@google.com

Review URL: https://codereview.chromium.org//636153003

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@40995 260f80e4-7a28-3924-810f-c04153c831b5