[cfe-commits] [patch] Falling off main() returns zero

[John McCall]

This patch implements the C/C++ requirement that falling off main 
returns zero.  The easiest way to do this is to simply initialize the 
return-value alloca to zero at the start of the function.

This is a pretty obvious patch, but this is my first foray into codegen, 
so maybe I'm doing this horridly wrong.

John.
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