[asm.js] [wasm] Store function start position for stack check

src/asmjs/asm-wasm-builder.cc

Index: src/asmjs/asm-wasm-builder.cc
diff --git a/src/asmjs/asm-wasm-builder.cc b/src/asmjs/asm-wasm-builder.cc
index 4996203ce2bba91cb888cb44c2a59f14b38e9b59..8556b13e55d3f20789f754adb8181d2a9accc3bd 100644
--- a/src/asmjs/asm-wasm-builder.cc
+++ b/src/asmjs/asm-wasm-builder.cc
@@ -176,6 +176,11 @@ class AsmWasmBuilderImpl final : public AstVisitor<AsmWasmBuilderImpl> {
     }
     current_function_builder_ = LookupOrInsertFunction(decl->proxy()->var());
     scope_ = kFuncScope;
+
+    // Record start of the function, used as position for the stack check.
+    current_function_builder_->SetAsmFunctionStartPosition(
+        decl->fun()->start_position());
+
     RECURSE(Visit(decl->fun()));
     decl->set_fun(old_func);
     if (new_func_scope != nullptr) {