Update LLVM to rust-llvm-2015-01-30

[dotdash]

No description provided.

[rust-highfive]

r? @alexcrichton

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[dotdash]

@lucab Just a heads up because I saw you were likely also working on updating LLVM.

[alexcrichton]

@bors: r+ faa3eab

[dotdash]

There's a bug left in the debug info part. I updated RustWrapper.cpp to expose the underlyingLLVMMetadataRef type, but the C API expects that to be wrapped in MetadataAsValue. The missing wrapping triggers an assertion compiling a run-pass test. I'll not get to fix that today, so I close this and will open a new PR when that's fixed.

[lucab]

@dotdash thanks. I'm not touching it right now, but you may want to coordinate with @michaelwoerister on #21512.

[michaelwoerister]

@dotdash Did you also run into an assertion in LLVMSetMetadata() at https://github.com/rust-lang/rust/blob/master/src/librustc_trans/trans/asm.rs#L153? I wasn't able to find out what the problem was there because everything looked like it should work. But maybe I introduced a bug somewhere along the way myself.

Feel free to cc me if you are discussing any debuginfo problems.

[dotdash]

@michaelwoerister That was a regression in LLVM which I fixed upstream, it's in the new rust-llvm snapshot I made yesterday.

[michaelwoerister]

@dotdash That's great. I thought that that might be the problem, but overlooked the part where the MDNode indirection was stripped away.