getFeatureTable() doesn't exist in LLVM 4.x

[ishitatsuyuki]

Blame: c471020
Arch Linux, LLVM 4.0.1-5 (using system llvm shared)

cargo:warning=../rustllvm/PassWrapper.cpp: In function ‘bool LLVMRustHasFeature(LLVMTargetMachineRef, const char*)’:
cargo:warning=../rustllvm/PassWrapper.cpp:185:58: error: ‘const class llvm::MCSubtargetInfo’ has no member named ‘getFeatureTable’; did you mean ‘getFeatureBits’?
cargo:warning=   const ArrayRef<SubtargetFeatureKV> FeatTable = MCInfo->getFeatureTable();
cargo:warning=                                                          ^~~~~~~~~~~~~~~
cargo:warning=                                                          getFeatureBits

[TimNN]

The problem is likely that getFeatureTable() is provided by a custom patch to the rust LLVM fork: rust-lang/llvm@68e1e29

[alexcrichton]

cc @lu-zero, mind taking a look here?

[lu-zero]

Sure, I misread the guards somehow and now I'm much sleepier so I guess I'll send PR with the correct guard in ~10 hours from now.