IR: handle control flow constructs (#186)

* IR: handle control flow constructs

This change includes a bunch of fixes and additions to the IR path:

- `slang-ir-assembly` is now a valid output target (so we can use it for testing)
  - This uses what used to be the IR "dumping" logic, revamped to support much prettier output.
  - A future change will need to add back support for less prettified output to use when actually debugging

- IR generation for `for` loops and `if` statements is supported

- HLSL output from the above control flow constructs is implemented

- Revamped the handling of l-values, and in particular work on compound ops like `+=`

- Add basic IR support for `groupshared` variables

- Add basic IR support for storing compute thread-group size

- Output semantics on entry point parameters
  - This uses the AST structures to find semantics, so its still needs work

- Pass through loop unroll flags
  - This is required to match `fxc` output, at least until we implement
    unrolling ourselves.

* Fixup: 64-bit build issues.

* fixup for merge

1 files changed, 2 insertions, 0 deletions

diff --git a/slang.h b/slang.h
index e9b817dbb..161e703f5 100644
--- a/slang.h
+++ b/slang.h
@@ -76,6 +76,8 @@ extern "C"
         SLANG_DXBC,
         SLANG_DXBC_ASM,
         SLANG_REFLECTION_JSON,
+        SLANG_IR,
+        SLANG_IR_ASM,
     };
 
     typedef int SlangPassThrough;