[LLVMbugs] DSAA patch

[Domagoj Babic]

Several minor modifications:
- dumps to std::cerr that were not guarded by DEBUG() are commented out
- introduced -dsa-no-warn hidden option that disables complains about unknown
  functions (disabled by default)
- added debug intrinsics to Local.cpp:visitCallSite as NOP

The patch compiles and runs fine (tested on cca 30 open source projects with
cca 2 MLOC of C code)

Domagoj
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