[SPIRV] Fix DebugSource for files which are not found #7662
+28
−1
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#4218 and #4362 identified and partially fixed problems with DebugSource generation. #6085 recognized that exe and API users were having different outputs in DebugSource, and attempted to fix that. However, as the conversation in #7569 shows, the solution was not entirely correct. This PR causes dxc to connect the input source string, whether by exe or API, to one and only one DebugSource, like other compilers. Files which are not found produce a DebugSource without the second operand.
This PR fixes #7569