Add a new `CreateIntrinsic` overload with no `Types`, useful for
creating calls to non-overloaded intrinsics that don't need additional
mangling.

Identified with misc-include-cleaner.

Convert many instances of:
  Fn = Intrinsic::getOrInsertDeclaration(...);
  CreateCall(Fn, ...)
to the equivalent CreateIntrinsic call.

Rename the function to reflect its correct behavior and to be consistent
with `Module::getOrInsertFunction`. This is also in preparation of
adding a new `Intrinsic::getDeclaration` that will have behavior similar
to `Module::getFunction` (i.e, just lookup, no creation).

We have a lot of repeated code with random constants.
Particular values are not important, the one just needs to be
bigger then another.

UR_NONTAKEN_WEIGHT is selected as it's the most common one.

Since we no longer support typed LLVM IR pointer types, the code can
be simplified into for example using PointerType::get directly instead
of using Type::getInt8PtrTy and Type::getInt32PtrTy etc.

Differential Revision: https://reviews.llvm.org/D156733

Mostly removing includes of InitializePasses.h and Pass.h in
passes that no longer has support for the legacy PM.

Namely CrossDSOCFI and GlobalSplit.

These are part of the optimization pipeline, of which the legacy pass manager version is deprecated.

I also ran `git clang-format` to get the headers in the right order for
the new location, which has changed the order of other headers in two
files.

Identified with readability-qualified-auto.