[wasm] Rename ast-decoder.* to function-body-decoder.*

src/wasm/wasm-opcodes.h

Index: src/wasm/wasm-opcodes.h
diff --git a/src/wasm/wasm-opcodes.h b/src/wasm/wasm-opcodes.h
index 936b0203b35e1ff4f1dbbfaa5316a5655efe61d1..fd67fed69d86e72a32b707352d84b09f64ffd5cf 100644
--- a/src/wasm/wasm-opcodes.h
+++ b/src/wasm/wasm-opcodes.h
@@ -27,7 +27,7 @@ enum LocalTypeCode {
 // Type code for multi-value block types.
 static const uint8_t kMultivalBlock = 0x41;
 
-// We reuse the internal machine type to represent WebAssembly AST types.
+// We reuse the internal machine type to represent WebAssembly types.
 // A typedef improves readability without adding a whole new type system.
 typedef MachineRepresentation LocalType;
 const LocalType kAstStmt = MachineRepresentation::kNone;