review (XS) for 6970566: runThese fails with SIGSEGV

[Tom Rodriguez]

http://cr.openjdk.java.net/~never/6970566

6970566: runThese fails with SIGSEGV
Reviewed-by:

In the fix for 6965184 I added some code to track the number of
adapters in the code cache by calling CodeCache::commit after the
AdapterBlob was created.  The code was missing a null check in case
the allocation failed and that would lead to crashes if the code cache
filled up.  Instead of adding a null check I moved it into the
AdapterBlob constructor to mirror other calls to commit.  I also
deleted a dead constructor.