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`_mm_cvtsd_ss` passed two `__m128d` to `llvm.x86.sse2.cvtsd2ss`,
which takes `(<4 x float>, <2 x double>)`, so LLVM failed with
"Intrinsic has incorrect argument type". `_mm_cvtss_sd` used
`llvm.x86.sse2.cvtss2sd`, which LLVM no longer has. Both wrappers
also took the wrong operand types; use Intel's (a: __m128, b: __m128d)
and (a: __m128d, b: __m128), and express `_mm_cvtss_sd` as a lane
conversion as clang does.
`_mm_prefetch` called `llvm.prefetch` without its pointer mangling and
`__rdtscp` declared `llvm.x86.rdtscp` as taking a pointer when it
returns `{i64, i32}`; both were rejected by LLVM too.