Request for reviews (XS): 7087727: JSR 292: C2 crash if ScavengeRootsInCode=2 when "static final" MethodHandle constants are in use

[Christian Thalinger]

http://cr.openjdk.java.net/~twisti/7087727/

7087727: JSR 292: C2 crash if ScavengeRootsInCode=2 when "static final" MethodHandle constants are in use
Reviewed-by:

The flag setting ScavengeRootsInCode=2 causes the JIT to inline more
constants.  This is generally a good thing for performance, but can
cause bugs in compiled code.

The test case has a code pattern that looks similar to the
selectAlternative idiom but boils down to a different invoke bytecode
(invokevirtual in that case).  The current code in
PredictedDynamicCallGenerator::generate checks for invokespecial
(which is used by selectAlternative) and so code for invokedynamic is
generated (in non-debug builds) which eventually leads to a crash.

src/share/vm/opto/callGenerator.cpp