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This patch fixes MCJIT::addGlobalMapping by changing the implementation of the ExecutionEngineState class. The new implementation maintains a bidirectional mapping between symbol names (std::strings) and addresses (uint64_ts), rather than a mapping between Value*s and void*s. This has fix has been made for backwards compatibility, however the strongly preferred way to resolve unknown symbols is by writing a custom RuntimeDyld::SymbolResolver (formerly RTDyldMemoryManager) and overriding the findSymbol method. The addGlobalMapping method is a hangover from the legacy JIT (which has was removed in 3.6), and may be deprecated in a future release as part of a clean-up of the ExecutionEngine interface. Patch by Murat Bolat. Thanks Murat! llvm-svn: 233747
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