Request for reviews (XL): 6919934: JSR 292 needs to support x86 C1

[Christian Thalinger]

http://cr.openjdk.java.net/~twisti/6919934/webrev.01/

This implements JSR 292 support for C1 x86.  It also includes changes
from Tom that change C1 exception unwinding to operate as C2 does it.
This makes the JSR 292 implementation easier.

Testing: JPRT

-- Christian