Auto merge of #148803 - jsgf:rust-annotate-default, r=Kobzol

Build with -Zannotate-moves by default (non-stage-0 only)

Build rustc and tools with -Zannotate-moves by default, both to exercise the feature and because could be useful for doing performance measurement on rustc and its tools. This has no effect on generated code, it just adds extra debug info in
the form of some new inlined functions.

This also adds bootstrap.toml config options
```
# rust.annotate-moves = true
# rust.annotate-moves-size-limit = 65
```
to allow this to be controlled locally.

This is only added for stage 1 and later. Stage 0 (the bootstrap compiler) doesn't yet support -Zannotate-moves.

Author: bors