std: add Zero impls for &[] and &str.
Reproduce text changes from @brson PR 7176 and fix a typo therein
auto merge of #7198 : huonw/rust/slice-zeros, r=Aatch
Improved std::ascii
- Fixed tests
- Added methods
- Renamed casting methods to be shorter

closes #7150
mk: tests.mk simplify the method to clean arm testing directory
etc: modify adb_run_wrapper.sh to avoid 'expr' unrecognization at some android devices
etc: add TEST_EXEC_ENV for run-pass to adb_run_wrapper.sh
test: adjust some test cases of run-pass for android
std: fix stat struct of android (SEGV error from run-pass/stat.rs on android)
rt: fix jemalloc android cross-compile for mac
auto merge of #7195 : brson/rust/timertest, r=bstrie
auto merge of #7174 : SiegeLord/rust/remove_trim, r=brson

This change prevents the indentation in code blocks inside the /// doc comments
from being eaten. The indentation that is the same across the consecutive doc
comments is removed by the uindent_pass in librustdoc.

The bug can be seen, e.g., here: http://static.rust-lang.org/doc/std/iterator.html#example-12

I also altered how the block comments are treated, for consistency. There isn't much testing done on the documentation output (I added a few tests of my own for the modified function), so I don't know if anything relied on the previous behavior. I checked a number of documentation files and observed either no change in output or changes that consistent of the above bug being fixed.
auto merge of #7199 : Kimundi/rust/master, r=bstrie

- Fixed tests
- Added methods
- Renamed casting methods to be shorter
- Added unsafe versions

Closes #7150
Use DIBuilder in debuginfo
Made the while DebugContext mutable, not just created_* hashes
Disabled create_arg
Move "return" basic block after all other function blocks.
Debug loc for local var declarations
Removed extraneous string allocations.
Misc refactoring.
Fixed compile warnings.
Fixed whitespace "errors".
Fixed remaining issues to pass debug-test/* tests.
Made debugger scripts source line insensitive.