[DirectX] Validation: TGSM pointers must originate from an unambiguous TGSM global variable.

[farzonl]

This bug looks very similar to #139013

error case:

../../DXC_DEBUG_BUILD/bin/dxv validation/GemmSmallGemm_Bias_float_b16c32.dat

https://github.com/microsoft/DirectXShaderCompiler/blob/adffd31eb02f690d9d1afe86c7fa6f12b4e70aa1/lib/DxilValidation/DxilValidation.cpp#L3541

(lldb) expr Ptr
(llvm::BitCastInst *) $0 = 0x000000011e10ff58
(lldb) expr Ptr->dump()
  %18 = bitcast [512 x float] addrspace(3)* @aTile.1dim to [512 x float] addrspace(3)*

[damyanp]

Wait until #139013 is resolved and then re-evaluate priority if it still repros.