[LLVM] Update Host.h path (#16373)

[LLVM] Update Host.h LLVM header path

Due to LLVM PR llvm/llvm-project#74261, Host.h has been moved
to a new location in LLVM

Author: abhikran-quic

src/target/llvm/llvm_instance.cc

@@ -42,7 +42,11 @@
 #include <llvm/Support/CodeGen.h>
 #include <llvm/Support/CommandLine.h>
 #include <llvm/Support/ErrorOr.h>
+#if TVM_LLVM_VERSION >= 180
+#include <llvm/TargetParser/Host.h>
+#else
 #include <llvm/Support/Host.h>
+#endif
 #include <llvm/Support/MemoryBuffer.h>
 #include <llvm/Support/SourceMgr.h>
 #include <llvm/Support/TargetSelect.h>

src/target/llvm/llvm_module.cc

@@ -41,7 +41,11 @@
 #include <llvm/IR/Module.h>
 #include <llvm/IRReader/IRReader.h>
 #include <llvm/Support/FileSystem.h>
+#if TVM_LLVM_VERSION >= 180
+#include <llvm/TargetParser/Host.h>
+#else
 #include <llvm/Support/Host.h>
+#endif
 #include <llvm/Support/SourceMgr.h>
 #include <llvm/Support/raw_ostream.h>
 #include <llvm/Target/TargetMachine.h>