If a source range comes through a function-like macro expansion,

highlight the arguments to the macro as well as the identifier.

Before:

t.c:3:9: error: no matching function for call to '__tg_acos'; candidates are:
 return acos(x);
        ^~~~

after:

t.c:3:9: error: no matching function for call to '__tg_acos'; candidates are:
 return acos(x);
        ^~~~~~~

llvm-svn: 64743