[analyzer] Inline constructors for any object with a trivial destructor.

This allows us to better reason about status objects, like Clang's own
llvm::Optional (when its contents are trivially destructible), which are
often intended to be passed around by value.

We still don't inline constructors for temporaries in the general case.

<rdar://problem/11986434>

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Update comment.

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Use cast<> instead of static_cast.  Patch by Timur Iskhodzhanov!

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Update comment, per Jordan's suggestion.

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[analyzer] More internal stats collection.

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[analyzer] Update inlining design notes for r162681.

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[analyzer] Don't inline constructors for objects allocated with operator new.

Because the CXXNewExpr appears after the CXXConstructExpr in the CFG, we don't
actually have the correct region to construct into at the time we decide
whether or not to inline. The long-term fix (discussed in PR12014) might be to
introduce a new CFG node (CFGAllocator) that appears before the constructor.

Tracking the short-term fix in <rdar://problem/12180598>.

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This is a temporary solution until we have a better way to
parse doxygen comments for macros with libclang.

I'm not entirely happy about this script, but as it saves
a lot of work in keeping the docs up to date with the
actual code I think checking it in makes sense.



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[ms-inline asm] Add a new base class, AsmStmt, for the GCCAsmStmt and MSAsmStmt
classes.

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[ms-inline asm] Hoist common logic into the AsmStmt base class.

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[ms-inline asm] Base class AsmStmt implements these.

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Restore a -cc1 invariant that was causing problems on PPC64.
This test case is pretty bad, though.

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[analyzer] Look through casts when trying to track a null pointer dereference.

Also, add comments to addTrackNullOrUndefValueVisitor.

Thanks for the review, Anna!

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[ms-inline asm] Rename GenerateAsmString to generateAsmString to conform with
coding standards.  Also, add stub for MSAsmStmt class as part of unifying 
codegen logic for AsmStmts.

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MIPS: Use -G option to specify MIPS section threshold. Translate it
to the -mllvm -mips-ssection-threshold=<value> pair and pass to the frontend.
The patch suggested by Carl Norum.


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[ms-inline asm] Hoist common Expr handling logic into AsmStmt.

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[ms-inline asm] Add a few comments.

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Appease -Wnon-virtual-dtor

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CodeGen: When emitting stores for an initializer, only emit a GEP if we really need the store.

This avoids emitting many dead GEPs for large zero-initialized arrays.

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CodeGen: Hoist check from recursive function to its only callsite.

Suggested by Roman Divacky.

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