Possible stack frame calc dead code bug again!

Hello everyone, it's your friendly neighborhood compiler writer who
refuses to remove dead code!

We have a similar case to the previous bug, though this one appears to
only fail verification on Java 7...not on Java 6.

The bytecode that fails is shown here:
https://gist.github.com/8899f7b0c7f8cd741ef8

The error:

Stack map does not match the one at exception handler 56 in method
blah.block_0$RUBY$__file__(Lblah;Lorg/jruby/runtime/ThreadContext;Lorg/jruby/runtime/builtin/IRubyObject;Lorg/jruby/runtime/builtin/IRubyObject;Lorg/jruby/runtime/Block;)Lorg/jruby/runtime/builtin/IRubyObject;
at offset 29
java.lang.VerifyError: Stack map does not match the one at exception
handler 56 in method
blah.block_0$RUBY$__file__(Lblah;Lorg/jruby/runtime/ThreadContext;Lorg/jruby/runtime/builtin/IRubyObject;Lorg/jruby/runtime/builtin/IRubyObject;Lorg/jruby/runtime/Block;)Lorg/jruby/runtime/builtin/IRubyObject;
at offset 29

Other than the version number 51 in the class file, the same bytecode
verifies on Java 6. Something got stricter in 7? Something broke?

I've attached a zip containing the class file and the full output of
dumping the entire class's bytecode.

This is running on RC1ish (custom build).

Help?!

- Charlie

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