Remove manual byte counting from Opcode::Dump
Remove manual byte counting from Opcode::Dump

Summary:
Stream now has byte-counting functionality, so let's use this instead of manual byte
counting.

Reviewers: clayborg, davide

Reviewed By: davide

Subscribers: davide, lldb-commits

Differential Revision: https://reviews.llvm.org/D50677

git-svn-id: 4c4cc70b1ef44ba2b7963015e681894188cea27e@340179 91177308-0d34-0410-b5e6-96231b3b80d8
(cherry picked from commit be2b7f5d7a5c88825e5833a806f2af2028c865e5)

apple/swift-lldb,apple/swift-lldb,apple/swift-lldb,apple/swift-lldb,apple/swift-lldb,apple/swift-lldb