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[JITLink] Fix Wtype-limits gcc warning (NFC)
GCC warning: ``` In file included from /usr/include/c++/9/cassert:44, from /home/vsts/work/1/llvm-project/llvm/include/llvm/ADT/BitVector.h:21, from /home/vsts/work/1/llvm-project/llvm/include/llvm/Support/Program.h:17, from /home/vsts/work/1/llvm-project/llvm/include/llvm/Support/Process.h:32, from /home/vsts/work/1/llvm-project/llvm/lib/ExecutionEngine/JITLink/JITLinkMemoryManager.cpp:11: /home/vsts/work/1/llvm-project/llvm/lib/ExecutionEngine/JITLink/JITLinkMemoryManager.cpp: In member function ‘virtual llvm::Expected<std::unique_ptr<llvm::jitlink::JITLinkMemoryManager::Allocation> > llvm::jitlink::InProcessMemoryManager::allocate(const llvm::jitlink::JITLinkDylib*, const SegmentsRequestMap&)’: /home/vsts/work/1/llvm-project/llvm/lib/ExecutionEngine/JITLink/JITLinkMemoryManager.cpp:129:40: warning: comparison of unsigned expression >= 0 is always true [-Wtype-limits] 129 | assert(SlabRemaining.allocatedSize() >= 0 && "Mapping exceeds allocation"); | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~ ``` The return type of `allocatedSize()` is `size_t`, thus the expression `SlabRemaining.allocatedSize() >= 0` always evaluate to `true`.
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