[HLSL][SPIR-V] Change SPV AS map for groupshared (#143519)

The previous mapping we setting the hlsl_groupshared AS to 0, which
translated to either Generic or Function.
Changing this to 3, which translated to Workgroup.

Related to #142804

Author: Keenuts

clang/lib/Basic/Targets/SPIR.h

@@ -46,7 +46,7 @@ static const unsigned SPIRDefIsPrivMap[] = {
     0,  // ptr32_sptr
     0,  // ptr32_uptr
     0,  // ptr64
-    0,  // hlsl_groupshared
+    3,  // hlsl_groupshared
     12, // hlsl_constant
     10, // hlsl_private
     11, // hlsl_device
@@ -82,7 +82,7 @@ static const unsigned SPIRDefIsGenMap[] = {
     0,  // ptr32_sptr
     0,  // ptr32_uptr
     0,  // ptr64
-    0,  // hlsl_groupshared
+    3,  // hlsl_groupshared
     0,  // hlsl_constant
     10, // hlsl_private
     11, // hlsl_device

clang/test/CodeGenHLSL/group_shared.hlsl

@@ -3,6 +3,10 @@
 // RUN:   dxil-pc-shadermodel6.3-library %s \
 // RUN:   -emit-llvm -disable-llvm-passes -o - | FileCheck %s
 
+// RUN: %clang_cc1 -std=hlsl2021 -finclude-default-header -x hlsl -triple \
+// RUN:   spirv-unknown-vulkan1.3-compute %s \
+// RUN:   -emit-llvm -disable-llvm-passes -o - | FileCheck %s
+
 // Make sure groupshared translated into address space 3.
 // CHECK:@a = addrspace(3) global [10 x float]