Add GetCompilationUnit() to CompilerLLVM.

(cherry picked from commit f12475c0024534a17c0f007e1a8f8ac981932296)

Change-Id: I1579f8e93722e7098657becbb70117c9f6a109a1
diff --git a/src/compiler_llvm/compiler_llvm.h b/src/compiler_llvm/compiler_llvm.h
index 7481c8c..562a1d2 100644
--- a/src/compiler_llvm/compiler_llvm.h
+++ b/src/compiler_llvm/compiler_llvm.h
@@ -68,6 +68,14 @@
     return insn_set_;
   }
 
+  size_t GetNumCompilationUnits() const {
+    return cunits_.size();
+  }
+
+  const CompilationUnit* GetCompilationUnit(size_t i) const {
+    return cunits_[i];
+  }
+
   void SetElfFileName(std::string const& filename) {
     elf_filename_ = filename;
   }