da9c513c87
This implements the lowering of static local variables with the Itanium C++ ABI guard variable pattern in LoweringPrepare. This is initial support, errorNYI covering all that hasn't been added just yet. When a GlobalOp has the static_local attribute and a ctor region, this pass: 1. Creates a guard variable global (mangled name from AST) 2. Inserts the guard check pattern at each GetGlobalOp use site: - Load guard byte with acquire ordering - If zero, call __cxa_guard_acquire - If acquire returns non-zero, inline the ctor region code - Call __cxa_guard_release 3. Clears the static_local attribute and ctor region from the GlobalOp Once the new design doc lands I'll add more information over there.
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