[WGSL] __ref does not work as expected

[saipraveenb25]

__ref parameters do not work correctly. Objects passed as reference to function should not be placed in a local variable.

The following test replicates this behavior

// groupshared-ref-param.slang

//TEST:SIMPLE(filecheck=CHECK): -target wgsl -entry computeMain -stage compute


//TEST_INPUT:ubuffer(data=[0 0 0 0], stride=4):out,name=outputBuffer
RWStructuredBuffer<int> outputBuffer;

groupshared uint sharedVal;

[ForceInline]
uint workgroupUniformLoad(__ref uint val)
{
    __intrinsic_asm "workgroupUniformLoad(&($0))";
}

// Expect sharedVal to be passed by reference.
//
// CHECK: fn computeMain({{.*}}({{.*}})
// CHECK: {{.*}}workgroupUniformLoad(&((sharedVal_{{[a-zA-Z0-9_]*}}))){{.*}};
// CHECK: }


[numthreads(1, 1, 1)]
void computeMain(int3 dispatchThreadID: SV_DispatchThreadID)
{
    int idx = dispatchThreadID.x;

    sharedVal = 1;
    outputBuffer[0] = workgroupUniformLoad(sharedVal);
}

WGSL output:

@binding(0) @group(0) var<storage, read_write> outputBuffer_0 : array<i32>;

var<workgroup> sharedVal_0 : u32;

@compute
@workgroup_size(1, 1, 1)
fn computeMain(@builtin(global_invocation_id) dispatchThreadID_0 : vec3<u32>)
{
    sharedVal_0 = u32(1);
    var _S1 : u32 = u32(1);
    var _S2 : u32 = (workgroupUniformLoad(&((_S1))));
    sharedVal_0 = _S1;
    outputBuffer_0[i32(0)] = i32(_S2);
    return;
}

HLSL output (this works as expected):

#pragma pack_matrix(column_major)
#ifdef SLANG_HLSL_ENABLE_NVAPI
#include "nvHLSLExtns.h"
#endif

#ifndef __DXC_VERSION_MAJOR
// warning X3557: loop doesn't seem to do anything, forcing loop to unroll
#pragma warning(disable : 3557)
#endif


#line 9 "tests/language-feature/pointer/groupshared-ref-param.slang"
RWStructuredBuffer<int > outputBuffer_0 : register(u0);

static groupshared uint sharedVal_0;


#line 34
[numthreads(1, 1, 1)]
void computeMain(int3 dispatchThreadID_0 : SV_DispatchThreadID)
{

    sharedVal_0 = 1U;
    uint _S1 = (workgroupUniformLoad(&((sharedVal_0))));

#line 39
    outputBuffer_0[int(0)] = int(_S1);
    return;
}