- Remove pass initialization from pass constructors.
- https://github.com/llvm/llvm-project/issues/111767

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).

This iteration drops hunks where the loop body adds more elements.

This reverts commit 3614f65a7ba9d925010e3316a1d93bcebc632178.

fixupImmediateBr seems to resize ImmBranches.