Add missing #include in LLVM 16

Cherry pick of
https://llvm.googlesource.com/llvm-project/+/e62d0e1520e9eb3974b5d766100bf2be39a934d8

Compilation error happens when building Swiftshader for chromium:
inclusion of <type_traits> is needed for std::is_pod

Bug: b/272710814

Change-Id: I26f46d6a95bc0901d1096e5eca8728a4e416b053
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/71408
Kokoro-Result: kokoro <noreply+kokoro@google.com>
Commit-Queue: Jean-François Geyelin <jif@google.com>
Tested-by: Jean-François Geyelin <jif@google.com>
Reviewed-by: Ben Clayton <bclayton@google.com>

third_party/llvm-16.0/llvm/include/llvm/Demangle/ItaniumDemangle.h

diff --git a/third_party/llvm-16.0/llvm/include/llvm/Demangle/ItaniumDemangle.h b/third_party/llvm-16.0/llvm/include/llvm/Demangle/ItaniumDemangle.h
index 0dd49ea..121eae1 100644
--- a/third_party/llvm-16.0/llvm/include/llvm/Demangle/ItaniumDemangle.h
+++ b/third_party/llvm-16.0/llvm/include/llvm/Demangle/ItaniumDemangle.h
@@ -27,6 +27,7 @@
 #include <cstring>
 #include <limits>
 #include <new>
+#include <type_traits>
 #include <utility>
 
 DEMANGLE_NAMESPACE_BEGIN