1. Added `toolchain_suite` template and switched toolchain definitions
to it, so now each toolchain definition defines a regular and
`_shared` toolchain, with different values for `is_shared_library`
argument.
2. Changed the logic of choosing between `fPIC` and `fPIE` based on
`is_shared_library` arg.
3. Changed `shared_library` template to define a group, depending on
the same target in a shared toolchain, and a copy of an output
artifact.
4. Made a copy of `runtime:dart_shared_lib` config and add it
automatically to all shared libraries.
5. Removed `runtime:dart_shared_lib` config and `DART_SHARED_LIB`
define from existing `shared_library` targets.
This CL should be a no-op refactoring to enable
https://dart-review.googlesource.com/c/sdk/+/394102.
TEST=ci
Change-Id: I6c044254d8e74b6b3ddadbf784e58d5f641fbcf3
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/392661
Commit-Queue: Ivan Inozemtsev <iinozemtsev@google.com>
Reviewed-by: Ryan Macnak <rmacnak@google.com>
Ivan Inozemtsev
a999cec694