i965/cfg: Slightly rearrange dead_control_flow_eliminate
i965/cfg: Slightly rearrange dead_control_flow_eliminate

'git diff -w' is a bit more illustrative.  A couple declarations were
moved, the continue was removed, and the code was reindented.  This will
simplify future changes.

Signed-off-by: Ian Romanick <2b237cafb16dc45038e85df6c85e74e6d899eba9@intel.com>
Reviewed-by: Francisco Jerez <5906ff32bdd9fd8db196f6ba5ad3afd6f9257ea5@riseup.net>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler