Add gdb pretty printer for MutableArrayRef, remove ConstArrayRef.

[merge_guards_bot]

Unit tests: pass. 61127 tests passed, 0 failed and 728 were skipped.

clang-tidy: pass.

clang-format: pass.

Build artifacts: diff.json, clang-tidy.txt, clang-format.patch, CMakeCache.txt, console-log.txt, test-results.xml

[dblaikie]

Ah, thanks for that - seems I wrote this as I had /wanted/ ArrayRef to be implemented, rather than how it ended up being implemented. (when MutableArrayRef was proposed, I had proposed changing ArrayRef to be mutable and introducing ConstArrayRef but folks didn't want the churn - guess that stuck in my head a bit).

llvm/utils/gdb-scripts/prettyprinters.py

class TwinePrinter:
 
   def to_string(self):
     return self.string_from_twine_object(self._val)
 
 pp = gdb.printing.RegexpCollectionPrettyPrinter("LLVMSupport")
 pp.add_printer('llvm::SmallString', '^llvm::SmallString<.*>$', SmallStringPrinter)
 pp.add_printer('llvm::StringRef', '^llvm::StringRef$', StringRefPrinter)
 pp.add_printer('llvm::SmallVectorImpl', '^llvm::SmallVector(Impl)?<.*>$', SmallVectorPrinter)
-pp.add_printer('llvm::ArrayRef', '^llvm::(Const)?ArrayRef<.*>$', ArrayRefPrinter)
+pp.add_printer('llvm::ArrayRef', '^llvm::(Mutable)?ArrayRef<.*>$', ArrayRefPrinter)
 pp.add_printer('llvm::Expected', '^llvm::Expected<.*>$', ExpectedPrinter)
 pp.add_printer('llvm::Optional', '^llvm::Optional<.*>$', OptionalPrinter)
 pp.add_printer('llvm::DenseMap', '^llvm::DenseMap<.*>$', DenseMapPrinter)
 pp.add_printer('llvm::Twine', '^llvm::Twine$', TwinePrinter)
 gdb.printing.register_pretty_printer(gdb.current_objfile(), pp)