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Indirect call wrapping helps MSanDR (dynamic instrumentation companion tool for MSan) to catch all cases where execution leaves a compiler-instrumented module by allowing the tool to rewrite targets of indirect calls. This change is an optimization that skips wrapping for calls when target is inside the current module. This relies on the linker providing symbols at the begin and end of the module code (or code + data, does not really matter). Gold linker provides such symbols by default. GNU (BFD) linker needs a link flag: -Wl,--defsym=__executable_start=0. More info: https://code.google.com/p/memory-sanitizer/wiki/MSanDR#Native_exec git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@194697 91177308-0d34-0410-b5e6-96231b3b80d8
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