[cfe-dev] A patch for chroot checker

[章磊]

hi, clang

This patch try to check improper use of chroot.

In order to implement this checker, i add a subclass (SymbolEnv) of
SymbolData to represent some environment variables. Now it contains only one
kind of environment variables(JailKind).Then adds several states to the Jail
Symbol.

This is an experimental checker, and i don't know it is the right way to do
this stuff.

I'll appreciate it if there are any advice about this patch.



-- 
Best regards!

Lei Zhang
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