sparse-llvm op_cast should support casting floating type values to integer

[Dibyendu Majumdar <mobile@xxxxxxxxxxxxxxx>]

Hi,

While investigating an assertion failure when compiling minilua I
found that op_cast implementation in sparse-llvm doesn't handle the
scenario where the input is a floating point number. I think the
following change is needed:

 switch (LLVMGetTypeKind(LLVMTypeOf(src))) {
  case LLVMPointerTypeKind:
   op = LLVMPtrToInt;
   break;
  case LLVMIntegerTypeKind:
   width = LLVMGetIntTypeWidth(LLVMTypeOf(src));
   if (insn->size < width)
    op = LLVMTrunc;
   else if (insn->size == width)
    op = LLVMBitCast;
   break;
  case LLVMFloatTypeKind:
  case LLVMDoubleTypeKind:
   op = LLVMFPToSI;
   break;

Thanks and Regards
Dibyendu
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