Add reverse(ContainerTy) range adapter.

For cases where we needed a foreach loop in reverse over a container,
we had to do something like

  for (const GlobalValue *GV : make_range(TypeInfos.rbegin(),
                                          TypeInfos.rend())) {

This provides a convenience method which shortens this to

  for (const GlobalValue *GV : reverse(TypeInfos)) {

There are 2 versions of this, with a preference to the rbegin() version.

The first uses rbegin() and rend() to construct an iterator_range.

The second constructs an iterator_range from the begin() and end() methods
wrapped in std::reverse_iterator's.

Reviewed by David Blaikie.

llvm-svn: 243563

1 files changed, 1 insertions, 2 deletions

diff --git a/llvm/lib/CodeGen/AsmPrinter/ARMException.cpp b/llvm/lib/CodeGen/AsmPrinter/ARMException.cpp
index 5f91763f27b..462e5d19c8d 100644
--- a/llvm/lib/CodeGen/AsmPrinter/ARMException.cpp
+++ b/llvm/lib/CodeGen/AsmPrinter/ARMException.cpp
@@ -115,8 +115,7 @@ void ARMException::emitTypeInfos(unsigned TTypeEncoding) {
     Entry = TypeInfos.size();
   }
 
-  for (const GlobalValue *GV : make_range(TypeInfos.rbegin(),
-                                          TypeInfos.rend())) {
+  for (const GlobalValue *GV : reverse(TypeInfos)) {
     if (VerboseAsm)
       Asm->OutStreamer->AddComment("TypeInfo " + Twine(Entry--));
     Asm->EmitTTypeReference(GV, TTypeEncoding);