Remove unused Endian.h includes, NFC
Mainly avoids including Host.h everywhere:
$ diff -u <(sort thedeps-before.txt) <(sort thedeps-after.txt) \
| grep '^[-+] ' | sort | uniq -c | sort -nr
3141 - /usr/local/google/home/rnk/llvm-project/llvm/include/llvm/Support/Host.h
diff --git a/clang/unittests/CodeGen/TBAAMetadataTest.cpp b/clang/unittests/CodeGen/TBAAMetadataTest.cpp
index c2a21bf..feea864 100644
--- a/clang/unittests/CodeGen/TBAAMetadataTest.cpp
+++ b/clang/unittests/CodeGen/TBAAMetadataTest.cpp
@@ -18,6 +18,7 @@
#include "llvm/IR/Constants.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Module.h"
+#include "llvm/Support/Host.h"
#include "llvm/Support/MemoryBuffer.h"
#include "gtest/gtest.h"
#include <memory>