quiche: Work around Clang miscompile on mipsel

src/net/third_party/quiche/src/quiche/http2/hpack/huffman/hpack_huffman_decoder.h

@@ -23,6 +23,10 @@
 
 namespace http2 {
 
+#if defined(__MIPSEL__) && !defined(__LP64__)
+// Clang 18+ miscompiles "uint64_t x; size_t y; x <<= y;" on mipsel.
+typedef uint32_t HuffmanAccumulator;
+#else
 // HuffmanAccumulator is used to store bits during decoding, e.g. next N bits
 // that have not yet been decoded, but have been extracted from the encoded
 // string).  An advantage of using a uint64 for the accumulator
@@ -34,6 +38,7 @@ namespace http2 {
 // reach 30), and then keep track of the last two bits we've not been able to
 // add to the accumulator.
 typedef uint64_t HuffmanAccumulator;
+#endif
 typedef size_t HuffmanAccumulatorBitCount;
 
 // HuffmanBitBuffer stores the leading edge of bits to be decoded. The high