[fuzzer] Fix threaded stack printing and nested mallocs

Summary: Nested mallocs are possible with internal symbolizer.

Reviewers: kcc

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D39397

llvm-svn: 317034
GitOrigin-RevId: 58da33e35ccdb19cf789ba0cd9b5c021a0f9f43a
1 file changed