Rename compiler_llvm CompilationUnit to LlvmCompilationUnit

Also fixed stray ART_TEST_CFLAGS to LOCAL_CFLAGS
Also fixed relative includes

Tried to change CompilationUnit to reference LlvmCompilationUnit, but
that causes issues because of the split libart-compiler
libart-compiler-llvm.

Change-Id: I7a490f339add6355a20c1cedae858ccf6967a6aa
diff --git a/src/compiler_llvm/compiler_llvm.h b/src/compiler_llvm/compiler_llvm.h
index bb14c49..b11ce12 100644
--- a/src/compiler_llvm/compiler_llvm.h
+++ b/src/compiler_llvm/compiler_llvm.h
@@ -55,7 +55,7 @@
 namespace art {
 namespace compiler_llvm {
 
-class CompilationUnit;
+class LlvmCompilationUnit;
 class IRBuilder;
 
 class CompilerLLVM {
@@ -94,7 +94,7 @@
   }
 
  private:
-  CompilationUnit* AllocateCompilationUnit();
+  LlvmCompilationUnit* AllocateCompilationUnit();
 
   Compiler* compiler_;