Fix llvm-readobj build error after r293569

Clang complains about an ambiguous call to printNumber() because it
can't work out what size_t should convert to. I picked uint64_t.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@293573 91177308-0d34-0410-b5e6-96231b3b80d8

tools/llvm-readobj/WasmDumper.cpp

@@ -59,7 +59,7 @@ class WasmDumper : public ObjDumper {
       DictScope SectionD(W, "Section");
       const char *Type = wasmSectionTypeToString(WasmSec->Type);
       W.printHex("Type", Type, WasmSec->Type);
-      W.printNumber("Size", WasmSec->Content.size());
+      W.printNumber("Size", (uint64_t)WasmSec->Content.size());
       W.printNumber("Offset", WasmSec->Offset);
       if (WasmSec->Type == wasm::WASM_SEC_CUSTOM) {
         W.printString("Name", WasmSec->Name);