Fix sign conversion warnings when comparing/assigning signed and unsigned integers

Author: r0qs

libyul/backends/evm/ssa/OperationForwardShuffler.h

@@ -164,12 +164,12 @@ class OperationForwardShuffler
 
 		size_t targetMinCount(Slot const& _slot) const
 		{
-			return util::valueOrDefault(targetMinCounts, _slot, 0);
+			return util::valueOrDefault(targetMinCounts, _slot, size_t{0});
 		}
 
 		size_t targetArgsCount(Slot const& _slot) const
 		{
-			return ranges::count_if(args, [&](auto const& _arg) { return _arg == _slot; });
+			return static_cast<size_t>(ranges::count_if(args, [&](auto const& _arg) { return _arg == _slot; }));
 		}
 
 		bool stackAdmissible() const

libyul/backends/evm/ssa/StackLayoutGenerator.cpp

@@ -318,7 +318,7 @@ void StackLayoutGenerator::defineStackIn(SSACFG::BlockId const& _blockId)
 			}
 			cumulativeCosts[i] = cumulativeCost;
 		}
-		auto argMin = std::distance(cumulativeCosts.begin(), ranges::min_element(cumulativeCosts));
+		auto argMin = static_cast<size_t>(std::distance(cumulativeCosts.begin(), ranges::min_element(cumulativeCosts)));
 		yulAssert(parentExits[argMin].second);
 		// fmt::print(">> ARGMIN: {} (out of {})\n", argMin, cumulativeCosts.size());
 		m_stackLayout[_blockId].stackIn = *parentExits[argMin].second;