Eliminate manual instruction wiring and auto-generate based on python script.

src/CMakeLists.txt

@@ -3,24 +3,15 @@ add_library(sirit
     sirit.cpp
     stream.h
     common_types.h
-    instructions/type.cpp
-    instructions/constant.cpp
-    instructions/function.cpp
+    # The bulk of instruction emitters are auto-generated by
+    # tools/generate_instructions.py from sirit.h + the SPIR-V grammar.
+    # See that script's docstring for what's intentionally NOT generated.
+    instructions/_generated.cpp
+    # Hand-written: multi-statement emit chains, methods that return their
+    # input id (Name/MemberName), the OpDebugPrintf helper, and OpLabel.
     instructions/flow.cpp
     instructions/debug.cpp
-    instructions/derivatives.cpp
-    instructions/memory.cpp
-    instructions/annotation.cpp
-    instructions/misc.cpp
-    instructions/logical.cpp
-    instructions/conversion.cpp
-    instructions/bit.cpp
-    instructions/arithmetic.cpp
     instructions/extension.cpp
-    instructions/image.cpp
-    instructions/group.cpp
-    instructions/barrier.cpp
-    instructions/atomic.cpp
 )
 
 target_compile_options(sirit PRIVATE ${SIRIT_CXX_FLAGS})