Auto merge of rust-lang#109961 - nikic:llvm-16.0.1, r=cuviper

Update to LLVM 16.0.1

Update to current `release/16.x` branch. I've opted for a rebase to get rid of all our custom cherry-picks.

Fixes rust-lang#109775.

r? `@cuviper`

Author: bors

.gitmodules

@@ -25,7 +25,7 @@
 [submodule "src/llvm-project"]
 	path = src/llvm-project
 	url = https://github.com/rust-lang/llvm-project.git
-	branch = rustc/16.0-2023-03-06
+	branch = rustc/16.0-2023-04-05
 [submodule "src/doc/embedded-book"]
 	path = src/doc/embedded-book
 	url = https://github.com/rust-embedded/book.git