[wasm] Deleting unused parameter from function "consume_u32v"

Merge branch 'master' of https://chromium.googlesource.com/v7/v8 into unused_variables

Removed unused variables "length" from the signature "consume_u32v". The variable length (passed in as a parameter) is not read from the function, rather it set based on the pc_ offset. However, the value set is also not used in the main line of control flow during decoding. This seems to be some dead code.

BUG=

Review-Url: https://codereview.chromium.org/2093823003
Cr-Commit-Position: refs/heads/master@{#37233}

src/wasm/ast-decoder.cc

@@ -584,10 +584,9 @@ class SR_WasmDecoder : public WasmDecoder {
       }
     }
     // Decode local declarations, if any.
-    int length;
-    uint32_t entries = consume_u32v(&length, "local decls count");
+    uint32_t entries = consume_u32v("local decls count");
     while (entries-- > 0 && pc_ < limit_) {
-      uint32_t count = consume_u32v(&length, "local count");
+      uint32_t count = consume_u32v("local count");
       byte code = consume_u8("local type");
       LocalType type;
       switch (code) {

src/wasm/decoder.h

@@ -204,10 +204,9 @@ class Decoder {
   }
 
   // Reads a LEB128 variable-length 32-bit integer and advances {pc_}.
-  uint32_t consume_u32v(int* length, const char* name = nullptr) {
+  uint32_t consume_u32v(const char* name = nullptr) {
     TRACE("  +%d  %-20s: ", static_cast<int>(pc_ - start_),
           name ? name : "varint");
-
     if (checkAvailable(1)) {
       const byte* pos = pc_;
       const byte* end = pc_ + 5;
@@ -224,10 +223,10 @@ class Decoder {
         shift += 7;
       }
 
-      *length = static_cast<int>(pc_ - pos);
+      int length = static_cast<int>(pc_ - pos);
       if (pc_ == end && (b & 0x80)) {
         error(pc_ - 1, "varint too large");
-      } else if (*length == 0) {
+      } else if (length == 0) {
         error(pc_, "varint of length 0");
       } else {
         TRACE("= %u\n", result);