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fuzzer: mask all CPU flags under memory sanitizer

--- a/tests/libfuzzer/dav1d_fuzzer.c

+++ b/tests/libfuzzer/dav1d_fuzzer.c

@@ -31,6 +31,7 @@

 #include <string.h>

 #include <dav1d/dav1d.h>

+#include "src/cpu.h"

 #include "dav1d_fuzzer.h"

 static unsigned r32le(const uint8_t *const p) {

@@ -61,6 +62,13 @@

     int err;

     dav1d_version();

+

+    // memory sanitizer is inherently incompatible with asm

+#if defined(__has_feature)

+  #if __has_feature(memory_sanitizer)

+    dav1d_set_cpu_flags_mask(0);

+  #endif

+#endif

     if (size < 32) goto end;

     ptr += 32; // skip ivf header