[cfe-commits] [patch] __has_trivial_* type traits

[John McCall]

This patch fixes the implementations of the __has_trivial_destructor and 
__has_trivial_constructor builtin pseudo-functions and additionally 
implements __has_trivial_copy and __has_trivial_assign.

I found it useful to introduce a method 
clang::Type::getBaseElementTypeNoTypeQual(), which just drills down past 
any array types and type qualifiers;  it's both more convenient and 
probably more efficient than iteratively calling getAsArrayType() / 
getElementType().  I'm not totally confident in its implementation, so 
I'd appreciate a review specifically of that.  I also went ahead and 
retrofitted some call sites that fit the iterative pattern.

John.
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