[HLSL] No matching constructor for struct initialization with a constant buffer struct

[Icohedron]

There is no matching constructor when initializing a local variable struct with a struct read from a constant buffer.

https://godbolt.org/z/e1n1xnj6r

// compile args: -T cs_6_7 -E CSMain -enable-16bit-types
RWStructuredBuffer<uint> output : register(u0);
struct MyStruct {
    int i;
};
cbuffer MyBuffer : register(b0) {
  MyStruct myS;
};
[numthreads(1, 1, 1)]
void CSMain() {
  MyStruct s = myS;
  output[0] = s.i;
}

<source>:10:12: error: no matching constructor for initialization of 'MyStruct'
   10 |   MyStruct s = myS;
      |            ^   ~~~
<source>:2:8: note: candidate constructor (the implicit copy constructor) not viable: cannot bind reference in address space 'hlsl_constant' to object in generic address space in 1st argument
    2 | struct MyStruct {
      |        ^~~~~~~~
<source>:2:8: note: candidate constructor (the implicit move constructor) not viable: cannot bind reference in address space 'hlsl_constant' to object in generic address space in 1st argument
    2 | struct MyStruct {
      |        ^~~~~~~~
<source>:2:8: note: candidate constructor (the implicit default constructor) not viable: requires 0 arguments, but 1 was provided
1 error generated.
Compiler returned: 1

[llvmbot]

@llvm/issue-subscribers-bug

Author: Deric C. (Icohedron)

There is no matching constructor when initializing a local variable struct with a struct read from a constant buffer.

https://godbolt.org/z/e1n1xnj6r

// compile args: -T cs_6_7 -E CSMain -enable-16bit-types
RWStructuredBuffer<uint> output : register(u0);
struct MyStruct {
    int i;
};
cbuffer MyBuffer : register(b0) {
  MyStruct myS;
};
[numthreads(1, 1, 1)]
void CSMain() {
  MyStruct s = myS;
  output[0] = s.i;
}

<source>:10:12: error: no matching constructor for initialization of 'MyStruct'
   10 |   MyStruct s = myS;
      |            ^   ~~~
<source>:2:8: note: candidate constructor (the implicit copy constructor) not viable: cannot bind reference in address space 'hlsl_constant' to object in generic address space in 1st argument
    2 | struct MyStruct {
      |        ^~~~~~~~
<source>:2:8: note: candidate constructor (the implicit move constructor) not viable: cannot bind reference in address space 'hlsl_constant' to object in generic address space in 1st argument
    2 | struct MyStruct {
      |        ^~~~~~~~
<source>:2:8: note: candidate constructor (the implicit default constructor) not viable: requires 0 arguments, but 1 was provided
1 error generated.
Compiler returned: 1

[farzonl]

Wait for @bogner cbuffer changes.