Patch to fix an invalid AST of a locally redeclared built-in which causes an IRGen crash

[jahanian]

Attached patch attempts to fix an IRGen crash caused by treating local redeclaration of a built-in function as a
built-in.  This patch removes an exception where the AST node for local redeclaration of built-in function
remains built-in. This causes the IRGen to treat the call to this function as built-in call resulting in crash.
Patch removes this exception, but also makes the implicit declaration of the built-in function as invalid.
Please review.

- Fariborz

	
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