Support blocks in asm->wasm global section.

src/wasm/asm-wasm-builder.cc

Index: src/wasm/asm-wasm-builder.cc
diff --git a/src/wasm/asm-wasm-builder.cc b/src/wasm/asm-wasm-builder.cc
index ba1f800c34afb28b7acdc6f9bed122daf30c7ed8..00f459316f6a4d69581f1ca6039ccb9b3222b386 100644
--- a/src/wasm/asm-wasm-builder.cc
+++ b/src/wasm/asm-wasm-builder.cc
@@ -110,11 +110,15 @@ class AsmWasmBuilderImpl : public AstVisitor {
         }
       }
     }
-    DCHECK(in_function_);
-    BlockVisitor visitor(this, stmt->AsBreakableStatement(), kExprBlock, false,
-                         static_cast<byte>(stmt->statements()->length()));
-    RECURSE(VisitStatements(stmt->statements()));
-    DCHECK(block_size_ >= 0);
+    if (in_function_) {
+      BlockVisitor visitor(this, stmt->AsBreakableStatement(), kExprBlock,
+                           false,
+                           static_cast<byte>(stmt->statements()->length()));
+      RECURSE(VisitStatements(stmt->statements()));
+      DCHECK(block_size_ >= 0);
+    } else {
+      RECURSE(VisitStatements(stmt->statements()));
+    }
   }
 
   class BlockVisitor {