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-emit-spirv.cpp b/source/slang/slang-emit-spirv.cpp
index ed50707d3..fe039feb0 100644
--- a/source/slang/slang-emit-spirv.cpp
+++ b/source/slang/slang-emit-spirv.cpp
@@ -788,7 +788,7 @@ struct SPIRVEmitContext
         ///
     SpvInst* emitGlobalInst(IRInst* inst)
     {
-        switch( inst->op )
+        switch( inst->getOp() )
         {
         // [3.32.6: Type-Declaration Instructions]
         //
@@ -1036,7 +1036,7 @@ struct SPIRVEmitContext
         /// Emit an instruction that is local to the body of the given `parent`.
     SpvInst* emitLocalInst(SpvInstParent* parent, IRInst* inst)
     {
-        switch( inst->op )
+        switch( inst->getOp() )
         {
         default:
             SLANG_UNIMPLEMENTED_X("unhandled instruction opcode");
@@ -1087,7 +1087,7 @@ struct SPIRVEmitContext
         // this code path is a catch-all for stuff that only needs to
         // be emitted if the owning instruction gets emitted.
 
-        switch( decoration->op )
+        switch( decoration->getOp() )
         {
         default:
             break;