Hotfix/fix stdlib error reporting (#866)

* * Add 'identity' version of bit casts (asint, asuint, asfloat) for scalar and vector
* Added identity bit casts for matrix (cos no op). We don't support matrix asint on glsl targets
* Added tests in bit-cast.slang

* Use kIRPseudoOp_Pos for identity asuint/asint/asfloat casts.

* * Stop crash if error in stdlib
* Use the buildin source manager when compiling stdlib - fixes that line numbers are displayed
* Typo fix

* Output line directives for 'meta' slang souce files into stdlib

* Improve comments and function names.

1 files changed, 8 insertions, 0 deletions

diff --git a/source/slang/slang.cpp b/source/slang/slang.cpp
index 45834c31d..0bba68aa6 100644
--- a/source/slang/slang.cpp
+++ b/source/slang/slang.cpp
@@ -1488,6 +1488,14 @@ void Session::addBuiltinSource(
         m_builtinLinkage,
         &sink);
 
+    SourceManager* sourceManager = getBuiltinSourceManager();
+
+    // Set the source manager on the sink
+    sink.sourceManager = sourceManager;
+    // Make the linkage use the builtin source manager
+    Linkage* linkage = compileRequest->getLinkage();
+    linkage->setSourceManager(sourceManager);
+
     Name* moduleName = getNamePool()->getName(path);
     auto translationUnitIndex = compileRequest->addTranslationUnit(SourceLanguage::Slang, moduleName);