b81a992797
Similar motivation to https://github.com/llvm/llvm-project/pull/165702. It was unused in all callsites and inconsistent with other APIs like `IsIntegerType` (which doesn't take a `count` parameter). If we ever need a "how many elements does this type represent", we can implement one with a new TypeSystem API that does exactly that. Some callsites checked for `count == 1` previously, but I suspect what they intended to do is check for whether it's a vector type or complex type, before reading the FP register. I'm somewhat confident that's the case because the `TypeSystemClang::GetTypeInfo` currently incorrectly sets the integer and floating point bits for complex and vector types (will fix separately). But some architectures might choose to pass single-element vectors in scalar registers. I should probably changes these to check the vector element size. All the `count == 2 && is_complex` were redundant because `count == 2` iff `is_complex == true`. So I just removed the count check there.
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