Fix use of uninitialized value in WastParser::ParseSimdV128Const.

Author: wffurr

src/wast-parser.cc

@@ -2909,7 +2909,9 @@ Result WastParser::ParseSimdV128Const(Const* const_,
           break;
       }
 
-      const_->set_expected_nan(lane, lane_const_.expected_nan());
+      if (Succeeded(result)) {
+        const_->set_expected_nan(lane, lane_const_.expected_nan());
+      }
     }
 
     if (Failed(result)) {
@@ -2952,7 +2954,7 @@ Result WastParser::ParseF32(Const* const_, ConstType const_type) {
   }
 
   auto literal = token.literal();
-  uint32_t f32_bits;
+  uint32_t f32_bits = 0;
   Result result = ParseFloat(literal.type, literal.text, &f32_bits);
   const_->set_f32(f32_bits);
   return result;
@@ -2972,7 +2974,7 @@ Result WastParser::ParseF64(Const* const_, ConstType const_type) {
   }
 
   auto literal = token.literal();
-  uint64_t f64_bits;
+  uint64_t f64_bits = 0;
   Result result = ParseDouble(literal.type, literal.text, &f64_bits);
   const_->set_f64(f64_bits);
   return result;