GDB pretty printers: Basic DenseMap support

Still prints the empty/tombstone keys (which some people would prefer,
but I find pretty noisy) because I haven't yet found a reliable way to
skip them (i

GDB pretty printers: Basic DenseMap support

Still prints the empty/tombstone keys (which some people would prefer,
but I find pretty noisy) because I haven't yet found a reliable way to
skip them (it requires calling into the running process to do so, which
isn't ideal for a pretty printer (doesn't work on a core file, for
example) - and gdb's ability to do so (or my ability to figure out how
to get gdb to do so) is limited) left some breadcrumbs for the next
person who might try to address that.

llvm-svn: 290011

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GDB pretty printer for llvm::Optional

(some other implementations of an optional pretty printer print the full
name of the optional type (including template parameter) - but seems if
the template pa

GDB pretty printer for llvm::Optional

(some other implementations of an optional pretty printer print the full
name of the optional type (including template parameter) - but seems if
the template parameter isn't printed for std::vector, not sure why it
would be printed for optional, so erring on the side of consistency in
that direction here - compact, etc, as well)

llvm-svn: 289976

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Fix gdb pretty printers to work with Python 3.

Differential Revision: https://reviews.llvm.org/D23202

llvm-svn: 277833

Reference gdb python type printer scripts from SmallString, SmallVector, ArrayRef, and StringRef

llvm-svn: 271357