Merge pull request rust-lang#139 from ptersilie/br_block

Serialise the successor block of unconditional branches.

Author: ltratt

llvm/lib/YkIR/YkIRWriter.cpp

@@ -450,6 +450,8 @@ class YkIRWriter {
       //
       // opcode:
       serialiseOpcode(OpCodeBr);
+      // successor:
+      serialiseBlockLabel(I->getSuccessor(0));
     } else {
       // opcode:
       serialiseOpcode(OpCodeCondBr);