[cfe-dev] LInk with/without LLVM_ENABLE_ABI_BREAKING_CHECKS

[Andy via cfe-dev]

Why sometimes is OK and not need link file llvm/lib/Support/ABIBreak.cpp
and sometimes is error with linked this file (required
EnableABIBreakingChecks or DisableABIBreakingChecks) In abi-breaking.h is:

namespace llvm {
#if LLVM_ENABLE_ABI_BREAKING_CHECKS
extern int EnableABIBreakingChecks;
LLVM_HIDDEN_VISIBILITY
__attribute__((weak)) int *VerifyEnableABIBreakingChecks =
    &EnableABIBreakingChecks;
#else
extern int DisableABIBreakingChecks;
LLVM_HIDDEN_VISIBILITY
__attribute__((weak)) int *VerifyDisableABIBreakingChecks =
    &DisableABIBreakingChecks;
#endif
}

Always is extern EnableABIBreakingChecks or DisableABIBreakingChecks,
but if is OK, no need link ABIBreak.cpp.
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