[Interpreter] Escape backticks when dumping format entities.

Currently we reject our own default disassembly-format string because it
contains two backticks which causes everything in between to be
interpreter as an expression by the command interpreter. This patch
fixes that by escaping backticks when dumping format strings.

git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@343471 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed