GPU Foreach Parsing and Checking (#1482)

This PR introduces parsing and semantic checking for a GPU foreach loop
for heterogeneouis programming. A GPU foreach loop takes the form:
```
__GPU_FOREACH(renderer, gridDims, LAMBDA(uint3 dispatchThreadID) {
        kernelCall(args, ...); });
```

And will allow the host code to call into a kernel with the correct
renderer and grid dimensions. This commit also introduces a hack to
unify types in the heterogeneous hello world file, which will hopefully
be amended in the future.

Co-authored-by: Tim Foley <tfoleyNV@users.noreply.github.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/source/slang/slang-lower-to-ir.cpp b/source/slang/slang-lower-to-ir.cpp
index a4542647a..9c4808f31 100644
--- a/source/slang/slang-lower-to-ir.cpp
+++ b/source/slang/slang-lower-to-ir.cpp
@@ -4114,6 +4114,12 @@ struct StmtLoweringVisitor : StmtVisitor<StmtLoweringVisitor>
         insertBlock(breakLabel);
     }
 
+    void visitGpuForeachStmt(GpuForeachStmt* stmt)
+    {
+        startBlockIfNeeded(stmt);
+        return;
+    }
+
     void visitExpressionStmt(ExpressionStmt* stmt)
     {
         startBlockIfNeeded(stmt);