[MCJIT] Fix some inconsistent handling of name mangling inside MCJIT.
This patch moves symbol mangling from findSymbol to getSymbolAddress. The
findSymbol, findExistingSymbol and findModuleForSymbol methods now always take
a mangled name, allowing the 'demangle-and-retry' cruft to be removed from
findSymbol. See http://llvm.org/PR28699 for details.
Patch by James Holderness. Thanks very much James!
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@281238
91177308-0d34-0410-b5e6-
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