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, 3 insertions, 3 deletions

diff --git a/source/slang/slang-ir-restructure-scoping.cpp b/source/slang/slang-ir-restructure-scoping.cpp
index c16db8f3c..0b8e37d31 100644
--- a/source/slang/slang-ir-restructure-scoping.cpp
+++ b/source/slang/slang-ir-restructure-scoping.cpp
@@ -150,7 +150,7 @@ IRInst* getDefaultInitVal(
     IRBuilder*  builder,
     IRType*     type)
 {
-    switch( type->op )
+    switch( type->getOp() )
     {
     default:
         return nullptr;
@@ -181,7 +181,7 @@ void defaultInitializeVar(
     IRType*     type)
 {
     IRInst* initVal = nullptr;
-    switch( type->op )
+    switch( type->getOp() )
     {
     case kIROp_VoidType:
     default:
@@ -217,7 +217,7 @@ static void fixValueScopingForInst(
     // because the emit logic will already create variables for them.
     // We could consider folding the logic to move out of SSA form
     // into this function, but that would add a lot of complexity for now.
-    if(def->op == kIROp_Param)
+    if(def->getOp() == kIROp_Param)
         return;
 
     // We would have a scoping violation if there exists some