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, 1 insertions, 1 deletions

diff --git a/source/slang/slang-ir-lower-existential.cpp b/source/slang/slang-ir-lower-existential.cpp
index 9df0e51db..c85d7af63 100644
--- a/source/slang/slang-ir-lower-existential.cpp
+++ b/source/slang/slang-ir-lower-existential.cpp
@@ -38,7 +38,7 @@ namespace Slang
                 rttiObject = builder->emitGetAddress(rttiType, rttiObject);
             }
             IRInst* packedValue = value;
-            if (valueType->op != kIROp_AnyValueType)
+            if (valueType->getOp() != kIROp_AnyValueType)
                 packedValue = builder->emitPackAnyValue(anyValueType, value);
             IRInst* tupleArgs[] = {rttiObject, inst->getWitnessTable(), packedValue};
             auto tuple = builder->emitMakeTuple(tupleType, 3, tupleArgs);