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-specialize-resources.cpp b/source/slang/slang-ir-specialize-resources.cpp
index 9a51351a9..23e68182e 100644
--- a/source/slang/slang-ir-specialize-resources.cpp
+++ b/source/slang/slang-ir-specialize-resources.cpp
@@ -614,7 +614,7 @@ struct ResourceOutputSpecializationPass
         // At the very least, we expect them to be operations with
         // the same opcode.
         //
-        if(value->op != representative->op)
+        if(value->getOp() != representative->getOp())
             return SLANG_FAIL;
 
         // Furthermore, only certain instructions are amenable to
@@ -628,7 +628,7 @@ struct ResourceOutputSpecializationPass
         // Each supported instruction opcode might introduce new
         // constraints on how `value` and `representative` must match.
         //
-        switch( value->op )
+        switch( value->getOp() )
         {
         default:
             // Any opcode we do not specifically enable should cause
@@ -1030,7 +1030,7 @@ struct ResourceOutputSpecializationPass
         // value in the context of the caller.
         //
         auto representative = info.representative;
-        switch( representative->op )
+        switch( representative->getOp() )
         {
         default:
             // Because we only allow certain instructions when specializing