[wasm] Refactor call site patching

src/wasm/leb-helper.h

Index: src/wasm/leb-helper.h
diff --git a/src/wasm/leb-helper.h b/src/wasm/leb-helper.h
index 0e4ba3418c3ba87ccc6298b69b3a3e7bc99d0a87..c3a74fdad7d1fba5f030ba4b974bcff7c32e8c83 100644
--- a/src/wasm/leb-helper.h
+++ b/src/wasm/leb-helper.h
@@ -5,6 +5,11 @@
 #ifndef V8_WASM_LEB_HELPER_H_
 #define V8_WASM_LEB_HELPER_H_
 
+#include <cstddef>  // size_t
+#include <cstdint>  // int32_t, ...
+
+#include "src/base/logging.h"
+
 namespace v8 {
 namespace internal {
 namespace wasm {
@@ -125,6 +130,23 @@ class LEBHelper {
     }
     return size;
   }
+
+  static inline uint32_t read_u32v(const uint8_t* src) {
+    return read_u32v(&src);
+  }
+
+  static inline uint32_t read_u32v(const uint8_t** src) {
+    uint32_t result = 0;
+    int shift = 0;
+    uint8_t b;
+    do {
+      b = *((*src)++);
+      DCHECK_GE(28, shift);
+      result = result | (static_cast<uint32_t>(b & 0x7F) << shift);
+      shift += 7;
+    } while ((b & 0x80) != 0);
+    return result;
+  }
 };
 
 }  // namespace wasm