[SPIRV] Emit LinkageType for function with hidden visibility

Author: jmmartinez

llvm/lib/Target/SPIRV/SPIRVUtils.cpp

@@ -1042,7 +1042,7 @@ getFirstValidInstructionInsertPoint(MachineBasicBlock &BB) {
 
 std::optional<SPIRV::LinkageType::LinkageType>
 getSpirvLinkageTypeFor(const SPIRVSubtarget &ST, const GlobalValue &GV) {
-  if (GV.hasLocalLinkage() || GV.hasHiddenVisibility())
+  if (GV.hasLocalLinkage())
     return std::nullopt;
 
   if (GV.isDeclarationForLinker())

llvm/test/CodeGen/SPIRV/linkage/link-hidden.ll

@@ -1,6 +1,9 @@
-; RUN: not llc -verify-machineinstrs -O0 -mtriple=spirv-unknown-unknown %s -o - 2>&1 | FileCheck %s
-; CHECK: LLVM ERROR: Unknown function in:
-; CHECK-SAME: OpFunctionCall %{{[0-9]+}}:type, @bar
+; RUN: llc -verify-machineinstrs -O0 -mtriple=spirv-unknown-unknown %s -o - | FileCheck %s
+; RUN: %if spirv-tools %{ llc -O0 -mtriple=spirv-unknown-unknown %s -o - -filetype=obj | spirv-val %}
+
+; CHECK: OpName %[[BAR:[0-9]+]] "bar"
+; CHECK: OpDecorate %[[BAR]] LinkageAttributes "bar" Import
+; CHECK: %[[BAR]] = OpFunction
 
 define hidden spir_kernel void @foo() addrspace(4) {
 entry: