[cfe-commits] [PATCH] call graph building

[Zhongxing Xu]

This is an initial implementation of call graph building based on pch
reader and the new Program/Entity facility. It is very primitive but
functional.
Put the files under clang/tools/wpa (meaning 'whole program
analysis'). After 'make', a new command 'clang-analyze' will be
generated. It takes a list of .ast files and build call graph over
them.

-Zhongxing
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