[StrTable] Mechanically convert Hexagon builtins to use TableGen (#123460)

This switches them to use the common builtin TableGen emission.

The fancy feature string preprocessor tricks are replaced with a fairly
direct translation into TableGen.

All of the actual definitions were created using a quite hack-y Python
script that was never intended to be productionized. It preserves the
order, spacing, and even comments from the original files. For
posterity, the script used is here:

https://gist.github.com/chandlerc/f53c7d735e33eecf388529bd9a6010df

The original `.def` file appears to be generated by some out-of-tree
`iset.py` script, which because it is out of tree I couldn't update. It
should be very straightforward though to update it to generate a similar
structure as was used to produce the `.td` file.

In addition to helping move towards TableGen for all of the builtins,
these builtins in particular can be *much* more efficiently handled
using TableGen when we start emitting string tables for them because it
allows de-duplicating all of the feature strings.

The commit sha parent at the time the PR was made is
7253c6fde498c4c9470b681df47d46e6930d6a02 and at that commit, the
resulting TableGen file produces a `.inc` file that only differs in
whitespace and the order of the builtins defined.

1 files changed, 1 insertions, 1 deletions

diff --git a/clang/lib/Basic/Targets/Hexagon.cpp b/clang/lib/Basic/Targets/Hexagon.cpp
index b5e06b6..2e173e0 100644
--- a/clang/lib/Basic/Targets/Hexagon.cpp
+++ b/clang/lib/Basic/Targets/Hexagon.cpp
@@ -211,7 +211,7 @@ static constexpr Builtin::Info BuiltinInfo[] = {
   {#ID, TYPE, ATTRS, nullptr, HEADER, ALL_LANGUAGES},
 #define TARGET_BUILTIN(ID, TYPE, ATTRS, FEATURE)                               \
   {#ID, TYPE, ATTRS, FEATURE, HeaderDesc::NO_HEADER, ALL_LANGUAGES},
-#include "clang/Basic/BuiltinsHexagon.def"
+#include "clang/Basic/BuiltinsHexagon.inc"
 };
 
 bool HexagonTargetInfo::hasFeature(StringRef Feature) const {