Request for review (XS): 7132180: JSR 292: C1 JVM crash with ClassValue/MethodHandle

[Christian Thalinger]

http://cr.openjdk.java.net/~twisti/7132180/

7132180: JSR 292: C1 JVM crash with ClassValue/MethodHandle
Reviewed-by:

The logic for detecting the selectAlternative idiom in
GraphBuilder::for_method_handle_inline assumes that both inputs of the
phi node are constant.  This might now be the case.

The fix is to check for is_constant on the ObjectType of both inputs.

Tested with failing test.

src/share/vm/c1/c1_GraphBuilder.cpp