[cfe-commits] Fix init_priority behaviour (PR11480) + test-case

[Stepan Dyatkovskiy]

Hi all. Please find update patch for pr11480.

I made all as it was proposed by Anton in bug description:
http://llvm.org/bugs/show_bug.cgi?id=11480#c0

So, main changes are in EmitCXXGlobalInitFunc and EmitCXXGlobalDtorFunc.
For ctors/dtors with init_priority attribute I just generate separated 
init functions instead of single one. The exception is case when there 
are some ctors/dtors with same priority. In that case I put its 
invokation into a single init/dtor function, in order determined by its 
order in code.

I also changed CGCXXABI::registerGlobalDtor. I added VarDecl parameter 
here, since we need to now additional attributes of variable for which 
it is registered (init_priority for example).

The test-case was also included into the patch.

-Stepan.
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