Merge pull request #1086 from Shishpan/trunkFix

Added new header BasicAliasAnalysis.h, which appeared in 3.8.

opt.cpp

@@ -108,6 +108,9 @@
   #include <llvm/Analysis/TargetTransformInfo.h>
 #endif
 #include <llvm/Target/TargetMachine.h>
+#if ISPC_LLVM_VERSION >= ISPC_LLVM_3_8 // LLVM 3.8+
+  #include <llvm/Analysis/BasicAliasAnalysis.h>
+#endif
 #include <llvm/Analysis/Passes.h>
 #include <llvm/Support/raw_ostream.h>
 #include <llvm/Support/Dwarf.h>