libsanitizer: Initialize local_head member [PR126307]

The following patch cherry picks an upstream fix for this.

2026-07-20  Jakub Jelinek  <jakub@redhat.com>

	PR sanitizer/126307
	* tsan/tsan_trace.h: Cherry-pick llvm-project revision
	cdfdb06c9155080ec97d6e4f4dd90b6e7cefb0ca.

(cherry picked from commit b75f76eb7fbd6314d452471d5795d24f004de5f2)
1 file changed