r? @pcwalton 

A slice now always refers to something that returns an borrowed pointer, views don't exist anymore. If you want to have an explictit copy of a slice, use `to_owned()`

Referencing #4986.

Improves resolve by 20% as measured by time-passes on rustc.

Stage markers for stage3 and a trivial prelude fix.

renamed str::slice -> slice_DBG_UNIQ
changed vec slice method -> to_owned()
renamed vec view method  -> slice_V_DBG_BRWD

r? @catamorphism

This normalizes the how we call reverse iteration functions. It also adds a char_len method, and a method to iterate backwards over a string.

Refactor trans_call to separate out the translation of the arguments, environment, and return pointer.  Towards #3678.  r? @brson

r? @graydon

This is the first step in refactoring the deriving code in libsyntax. No code is changed, just rearranged.

Refactor the self-info so that the def-id is carried in ty_self()and the fn_ctxt doesn't need any self_info field at all. Pull out explicit self transformation into `check_method`. Step towards fixing `fn(&self)` to have a distinct lifetime. (cc #4846) 

r? @catamorphism

and the fn_ctxt doesn't need any self_info field at all.

Step towards fixing `fn(&self)` (cc #4846) to have a distinct
lifetime.

Removes a lot of instances of `/*bad*/ copy` throughout libsyntax/librustc. On the plus side, this shaves about 2s off of the runtime when compiling `librustc` with optimizations.

Ideally I would have run a profiler to figure out which copies are the most critical to remove, but in reality there was a liberal amount of `git grep`s along with some spot checking and removing the easy ones.

Partial Fix for #5265

- Enabling LLVM ARM ehabi option.
- Add ARM debug information manually for ccall.s
- Compile object file using Android-NDK.

Current LLVM trunk version can generate ARM debug information for assembly files but it is incomplete for object files. Unwinding on ARM can be done with LLVM trunk(the LLVM submodule of rust has problem on generating ARM debug information). See #5368

The Android-NDK detour(0f89eab8) can be removed after LLVM has complete feature of generating ARM debug information for object file.