Add an accessor for IRInst opcode (#1707)

* Add an accessor for IRInst opcode

This main changing is renaming `IRInst::op` over to `IRInst::m_op` and then adds an accessor `IRInst::getOp()` to read it. The rest of the changes are just changing use sites to `getOp` (or to `m_op` in the limited cases where we write to it).

This work is in anticipation of a future change that might need to store an extra bit in the same field as the opcode. It seemed better to do this massive refactoring as a separate PR.

* fixup

1 files changed, 2 insertions, 2 deletions

diff --git a/source/slang/slang-ir-lower-tuple-types.cpp b/source/slang/slang-ir-lower-tuple-types.cpp
index d9fd91d3d..a155ae8d3 100644
--- a/source/slang/slang-ir-lower-tuple-types.cpp
+++ b/source/slang/slang-ir-lower-tuple-types.cpp
@@ -42,7 +42,7 @@ namespace Slang
 
             if (!type)
                 return nullptr;
-            if (type->op != kIROp_TupleType)
+            if (type->getOp() != kIROp_TupleType)
                 return nullptr;
 
             RefPtr<LoweredTupleInfo> info = new LoweredTupleInfo();
@@ -123,7 +123,7 @@ namespace Slang
 
         void processInst(IRInst* inst)
         {
-            switch (inst->op)
+            switch (inst->getOp())
             {
             case kIROp_MakeTuple:
                 processMakeTuple((IRMakeTuple*)inst);