[PATCH] Internal option to warn on a given stack size.

[Quentin Colombet]

Hi,

Here is a patch that adds a llvm option to warn on a given stack size limit.
Option: -mllvm -warn-stack-size=<limit>
Output (if limit is exceeded): warning: Stack size limit exceeded (<actual size>) in <functionName>.

The motivation is that on some critical applications it is important to keep track of the size of the stack. Using that option one can ensure the stack is not growing beyond his expectation and if it does it gives some information on where to look.

The patch includes two target specific test cases, one for ARM and one for X86, but it should work for all targets.

Thanks for the review,

-Quentin


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