SPV_KHR_physical_storage_buffer/SPV: Add GL_EXT_buffer_reference_uvec2

Adds uvec2 <-> reference constructor support.
Switches from EXT to KHR for physical_storage_buffer.
diff --git a/SPIRV/GlslangToSpv.cpp b/SPIRV/GlslangToSpv.cpp
index 73689b8..afb405e 100644
--- a/SPIRV/GlslangToSpv.cpp
+++ b/SPIRV/GlslangToSpv.cpp
@@ -1399,7 +1399,7 @@
 
     if (glslangIntermediate->usingPhysicalStorageBuffer()) {
         addressingModel = spv::AddressingModelPhysicalStorageBuffer64EXT;
-        builder.addIncorporatedExtension(spv::E_SPV_EXT_physical_storage_buffer, spv::Spv_1_5);
+        builder.addIncorporatedExtension(spv::E_SPV_KHR_physical_storage_buffer, spv::Spv_1_5);
         builder.addCapability(spv::CapabilityPhysicalStorageBufferAddressesEXT);
     };
     if (glslangIntermediate->usingVulkanMemoryModel()) {
@@ -6273,6 +6273,10 @@
     case glslang::EOpConvPtrToUint64:
         convOp = spv::OpConvertPtrToU;
         break;
+    case glslang::EOpConvPtrToUvec2:
+    case glslang::EOpConvUvec2ToPtr:
+        convOp = spv::OpBitcast;
+        break;
 #endif
 
     default: