Add API for querying TypeLayout from a Type

Added two API functions:
1. `spReflection_FindTypeByName`, which returns a DeclRefType to the struct type with the given name. The function finds from all loaded modules in a `CompileRequest` for a decl with the given name, construct a `Type` object and cache it in `CompileRequest::types` dictionary. The subsequent calls to `spReflection_FindTypeByName` with the same name will simply returned the cached Type objects.
2. `spReflection_GetTypeLayout`, which returns a `TypeLayout` for a given `Type`. This function creates and caches the `TypeLayout` in the `TargetRequest` object that is used to create the `ProgramLayout`.

1 files changed, 2 insertions, 0 deletions

diff --git a/source/slang/type-layout.h b/source/slang/type-layout.h
index 904dacd91..38fabb009 100644
--- a/source/slang/type-layout.h
+++ b/source/slang/type-layout.h
@@ -456,6 +456,8 @@ public:
     // a dummy sampler just to appease glslang
     int bindingForHackSampler = 0;
     RefPtr<VarDeclBase> hackSamplerVar;
+
+    TargetRequest* targetRequest = nullptr;
 };
 
 struct LayoutRulesFamilyImpl;