Output block attributes, allow inline asm.
Output block attributes, allow inline asm.

Note whether unsafe or failure to BB decompose.

R=chrisha@chromium.org
BUG=

Review URL: https://codereview.chromium.org/1364493003.

google/syzygy,google/syzygy,supriyantomaftuh/syzygy,Eloston/syzygy,google/syzygy,Eloston/syzygy,supriyantomaftuh/syzygy,supriyantomaftuh/syzygy,google/syzygy,supriyantomaftuh/syzygy