User defined downstream compiler prelude (#1028)

* Added setDownstreamCompilerPrelude
Renamed setPassThroughPath to setDownstreamCompilerPath.
Fixed tests.
Added prelude directory & code to TestToolUtil to setup default preludes for testing/command line apis.

* Fix merge problem

* Remove hacks to make prelude work by adding a search path as no longer needed with 'user prelude'.

* Split up prelude into scalar intrinsics, and types.
Use slang.h for main header.
slang-cpp-prelude.h can now just include what it needs (relative to prelude directory) and define the few remaining things/work arounds.

* Fix typo.

1 files changed, 1 insertions, 1 deletions

diff --git a/source/slang/slang-options.cpp b/source/slang/slang-options.cpp
index c07ace929..a55322d31 100644
--- a/source/slang/slang-options.cpp
+++ b/source/slang/slang-options.cpp
@@ -824,7 +824,7 @@ struct OptionsParser
                             SlangPassThrough passThrough = SLANG_PASS_THROUGH_NONE;
                             if (SLANG_SUCCEEDED(_parsePassThrough(slice.getUnownedSlice(), passThrough)))
                             {
-                                session->setPassThroughPath(passThrough, name.getBuffer());
+                                session->setDownstreamCompilerPath(passThrough, name.getBuffer());
                                 continue;
                             }
                         }