[libFuzzer] Dump trace and provide correct msg for overwritten input.
[libFuzzer] Dump trace and provide correct msg for overwritten input.

Summary:
Now crashes with a stacktrace and uses 'overwrites-const-input' as the error
message instead of 'out-of-memory'.

Reviewers: morehouse, Dor1s

Reviewed By: morehouse, Dor1s

Subscribers: #sanitizers, llvm-commits, metzman, Dor1s

Tags: #sanitizers, #llvm

Differential Revision: https://reviews.llvm.org/D68067

git-svn-id: c199f293c43da69278bea8e88f92242bf3aa95f7@373130 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/compiler-rt,llvm-mirror/compiler-rt,llvm-mirror/compiler-rt,llvm-mirror/compiler-rt,llvm-mirror/compiler-rt