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A wasm file crafted with a bogus section size can trigger an ASan issue in the DWARFObjInMemory constructor. Nip the problem in the bud when we read the wasm section. Found by OSS-Fuzz: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=3219 Differential Revision: https://reviews.llvm.org/D38777 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@316357 91177308-0d34-0410-b5e6-96231b3b80d8