[WebAssembly] Add more utility functions

Summary:
Added more utility functions that will be used in EH-related passes Also
changed `LoopBottom` function to `getBottom` and uses templates to be
able to handle other classes as well, which will be used in CFGSort
later.

Reviewers: dschuff

Subscribers: sbc100, jgravelle-google, sunfish, llvm-commits

Differential Revision: https://reviews.llvm.org/D48262

llvm-svn: 335006

1 files changed, 3 insertions, 2 deletions

diff --git a/llvm/lib/Target/WebAssembly/WebAssemblyCFGStackify.cpp b/llvm/lib/Target/WebAssembly/WebAssemblyCFGStackify.cpp
index a53fe28d264..dac9f10524c 100644
--- a/llvm/lib/Target/WebAssembly/WebAssemblyCFGStackify.cpp
+++ b/llvm/lib/Target/WebAssembly/WebAssemblyCFGStackify.cpp
@@ -127,7 +127,8 @@ static void PlaceBlockMarker(
   // Decide where in Header to put the BLOCK.
   MachineBasicBlock::iterator InsertPos;
   MachineLoop *HeaderLoop = MLI.getLoopFor(Header);
-  if (HeaderLoop && MBB.getNumber() > LoopBottom(HeaderLoop)->getNumber()) {
+  if (HeaderLoop &&
+      MBB.getNumber() > WebAssembly::getBottom(HeaderLoop)->getNumber()) {
     // Header is the header of a loop that does not lexically contain MBB, so
     // the BLOCK needs to be above the LOOP, after any END constructs.
     InsertPos = Header->begin();
@@ -181,7 +182,7 @@ static void PlaceLoopMarker(
 
   // The operand of a LOOP is the first block after the loop. If the loop is the
   // bottom of the function, insert a dummy block at the end.
-  MachineBasicBlock *Bottom = LoopBottom(Loop);
+  MachineBasicBlock *Bottom = WebAssembly::getBottom(Loop);
   auto Iter = std::next(MachineFunction::iterator(Bottom));
   if (Iter == MF.end()) {
     MachineBasicBlock *Label = MF.CreateMachineBasicBlock();