Clean up various LLVM FFI things in codegen_llvm
cc ```@ZuseZ4``` I touched some autodiff parts
The major change of this PR is [
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| .. | ||
| analyze.rs | ||
| block.rs | ||
| constant.rs | ||
| coverageinfo.rs | ||
| debuginfo.rs | ||
| intrinsic.rs | ||
| locals.rs | ||
| mod.rs | ||
| naked_asm.rs | ||
| operand.rs | ||
| place.rs | ||
| rvalue.rs | ||
| statement.rs | ||