[llvm] [llvm-exegesis] Add explicit error message with segfault address (PR #74210)

[Clement Courbet via llvm-commits]

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@@ -2,7 +2,7 @@
 
 # RUN: llvm-exegesis -mtriple=x86_64-unknown-unknown -mode=latency -snippets-file=%s -execution-mode=subprocess | FileCheck %s
 
-# CHECK: error:           'The benchmarking subprocess sent unexpected signal: Segmentation fault'
+# CHECK: error:           The snippet crashed with signal Segmentation fault at address 10000
 
-# LLVM-EXEGESIS-DEFREG RBX 0
+# LLVM-EXEGESIS-DEFREG RBX 10000
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legrosbuffle wrote:

Are we certain that `10000` is never mapped ? 

https://github.com/llvm/llvm-project/pull/74210