[PATCH][tablegen] Eliminate memory leaks in TGParser.cpp

[Anton Yartsev]

Hi all,

I've recently ran the alpha.cplusplus.NewDeleteLeaks checker over the 
LLVM codebase to eliminate false-positives. The checker evolved a number 
of real leaks. I've decided to fix some of them.
Attached is the patch that eliminates memory leaks found in the 
TGParser.cpp. Please review.

-- 
Anton

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