Regenerate ReStructuredText based manpages for llvm-project tools:

• bugpoint.1
• clang.1
• llc.1
• lldb.1
• lli.1
• llvm-ar.1
• llvm-as.1
• llvm-bcanalyzer.1
• llvm-cov.1
• llvm-diff.1
• llvm-dis.1
• llvm-dwarfdump.1
• llvm-extract.1
• llvm-link.1
• llvm-mca.1
• llvm-nm.1
• llvm-pdbutil.1
• llvm-profdata.1
• llvm-symbolizer.1
• llvm-tblgen.1
• opt.1

Add newly generated manpages for:

• llvm-addr2line.1 (this is an alias of llvm-symbolizer)
• llvm-cxxfilt.1
• llvm-objcopy.1
• llvm-ranlib.1 (this is an alias of llvm-ar)

Note that llvm-objdump.1 is an exception, as upstream has both a plain
.1 file, and a .rst variant. These will have to be reconciled upstream
first.

MFC after: 3 days