debug-info/function-arg-initialization.rs is xfail'd

[alexcrichton]

Currently the snapshots are blocked on this test passing, so I'm going to xfail it.

The relevant logs are at http://buildbot.rust-lang.org/builders/snap3-linux/builds/619/steps/test/logs/stdio, and the relevant portions of the relevant logs are:

test [debug-info] debug-info/function-arg-initialization.rs ... 
error: line not found in debugger output: $1 = 1
command: gdb -quiet -batch -nx -command=x86_64-unknown-linux-gnu/test/debug-info/function-arg-initialization.debugger.script x86_64-unknown-linux-gnu/test/debug-info/function-arg-initialization.stage2-i686-unknown-linux-gnu
stdout:
------------------------------------------

------------------------------------------
stderr:
------------------------------------------
x86_64-unknown-linux-gnu/test/debug-info/function-arg-initialization.debugger.script:3: Error in sourced command file:
No line 139 in file "../src/test/debug-info/function-arg-initialization.rs".

------------------------------------------

task '[debug-info] debug-info/function-arg-initialization.rs' failed at 'explicit failure', /home/rustbuild/src/rust-buildbot/slave/snap3-linux/build/src/compiletest/runtest.rs:909
�[31mFAILED�(B�[m

I'm not quite sure why the file can't be found, because I can definitely find the file. I ssh'd into the snap bot and was unable to figure out why gdb didn't want to read that file.

cc @michaelwoerister

[michaelwoerister]

Hm, I can't reproduce this... I have a small PR in the making. I'd suggest, I re-enable the test with it and we'll see if it passes again.