Fix clang build by giving a name to the enum.

TBR=fschneider@google.com

Review URL: https://codereview.chromium.org//809483002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@42371 260f80e4-7a28-3924-810f-c04153c831b5
Fix release x64 build:

- don't try using near jumps anymore;

- initialize variables in vm/cc/Bitwise with zeros.

TBR=fschneider@google.com
BUG=

Review URL: https://codereview.chromium.org//811453002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@42373 260f80e4-7a28-3924-810f-c04153c831b5
Disable 'Split && condition' if there is an 'else' statement.

R=danrubel@google.com
BUG=

Review URL: https://codereview.chromium.org//805053003

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@42374 260f80e4-7a28-3924-810f-c04153c831b5