Mention the possible dependencies of Clang binary packages.

(cherry picked from commit 1be44f0a55b0d59601230875a3aad083af3150cb)
Fixed a false transformation

skip parameters if it is unamed and its function decl
doesn't have definition.

(cherry picked from commit 7277413b333ec0d9ed5a12b0eafe5df4c8e0abc4)
fixed a crash

make another try upon an invalid loc

(cherry picked from commit bb67cac5015664ea506f658e98880bd5bfbf54cd)
Update the example for installing Clang/LLVM dependencies.

Thanks to Julien Cretin <creduce@ia0.eu> for discussion of what the
example command should actually be.

Julien notes that libtinfo-dev is actually a dependency of libedit-dev,
so one could simplify the command to just "apt-get install libedit-dev".
I didn't do this because I wanted the example to be more explicit.

(cherry picked from commit 03cb1ba267452db92fa4dad6516a8efc31a7a2c4)