swift234

introduce a new helper to SILBuilder that emits a StrongRelease operation,
scanning up the local block to see if it immediately cancels a retain 
operation.

Use this in mandatory inlining to zap more retains and release.  Before
this patch, the result LogicValue allocation blocked this optimization,
preventing the partial_apply from being deleted from the case in 
rdar://15328833.




Swift SVN r10447