[compiler-rt] [compiler-rt][asan] Allow optional leading dot in function names in complete_stack_trace.c (PR #227969)

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Himadhith wrote:

@riyaz86a Please disable the "private email address" feature in your Github settings so your commit info doesn't look like 69200125+riyaz86a at users.noreply.github.com.

https://github.com/llvm/llvm-project/pull/227969