Emit descriptor handle correctly for ParameterBlock<DescriptorHandle> (#8206)

In Metal, if `ParameterBlock` contains `DescriptorHandle` directly, it
would be emitted as DescriptorHandle literal, which is not valid Metal
code,

This fix adds a case for `kIROp_DescriptorHandleType` and directs it to
the Parent's `emitType` function to handle it.

1 files changed, 3 insertions, 0 deletions

diff --git a/source/slang/slang-emit-metal.cpp b/source/slang/slang-emit-metal.cpp
index 1915be58b..9858e51a1 100644
--- a/source/slang/slang-emit-metal.cpp
+++ b/source/slang/slang-emit-metal.cpp
@@ -1102,6 +1102,9 @@ void MetalSourceEmitter::emitSimpleTypeImpl(IRType* type)
     case kIROp_StructType:
         m_writer->emit(getName(type));
         return;
+    case kIROp_DescriptorHandleType:
+        emitType(type);
+        return;
 
     case kIROp_DoubleType:
         SLANG_UNEXPECTED("'double' type emitted");