[PowerPC] Drop invalid range metadata when lowering i64 load to fp in INT_TO_FP (#198705) When lowering an i64 load in LowerINT_TO_FP, we were forwarding the original !range metadata to a new f64 load. This is invalid because the metadata no longer matches the value type/semantics, and can trigger assertions when lowering i64 to fp (double or float) conversions. This patch fixes this by passing a nullptr for the Ranges operand when calling getLoad() and adds extra test cases to cover signed/unsigned i64 to f32/f64 conversions and to ensure they do not assert when the !range metadata is present. The assertion this patch attempts to fix is: ``` Assertion failed: (!MMO->getRanges() || (mdconst::extract<ConstantInt>(MMO->getRanges()->getOperand(0)) ->getBitWidth() == MemVT.getScalarSizeInBits() && MemVT.isInteger())) && "Range metadata and load type must match!" ``` This assert was originally seen when building Rust on AIX.
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