[clang] [llvm] [CFI] Extract DropTypeTestsPass from LowerTypeTestsPass (PR #192578)

[Peter Collingbourne via cfe-commits]

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@@ -193,33 +193,32 @@ struct ByteArrayBuilder {
 
 LLVM_ABI bool isJumpTableCanonical(Function *F);
 
-/// Specifies how to drop type tests.
-enum class DropTestKind {
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pcc wrote:

I would probably keep this (except for `None`) to avoid passing mysterious bools around.

https://github.com/llvm/llvm-project/pull/192578