[wasm] readSection: Avoid reading past eof (fixes oss-fuzz #3219)
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 llvm-svn: 316357
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