[LLDB][MIPS] Fix lldbplatformutil.py Failure
[LLDB][MIPS] Fix lldbplatformutil.py Failure

Patch by Nitesh Jain

Summary: This patch check whether first register is readable.

Subscribers: lldb-commits, mohit.bhakkad, sagar, bhushan
Reviewers: clayborg, ovyalov, jaydeep
Differential: http://reviews.llvm.org/D14635


git-svn-id: 4c4cc70b1ef44ba2b7963015e681894188cea27e@253555 91177308-0d34-0410-b5e6-96231b3b80d8

apple/swift-lldb,apple/swift-lldb,llvm-mirror/lldb,llvm-mirror/lldb,llvm-mirror/lldb,llvm-mirror/lldb,apple/swift-lldb,apple/swift-lldb,llvm-mirror/lldb,apple/swift-lldb,apple/swift-lldb