Avoid starting a new basic block when inlining a function.

Avoid starting a new basic block when inlining a function.

Instead of creating a fresh basic block for the inlined body,
I just simulate the outer environment in the middle of the current
block before updating the current environment to the inlined environment and
emitting the enter-inlined instruction.
Committed: https://code.google.com/p/v8/source/detail?r=10954

[Kevin Millikin (Google), 2012-03-07 11:59:47]

LGTM.