LDC: Set up CI with Azure Pipelines and Shippable

Azure: Windows x86 & x64, macOS x64, Linux x64, Android ARMv7-A
Shippable: Linux AArch64

2 packages per platform (enabled/disabled assertions), except for
cross-compiled Android.

Tagged builds are uploaded to the corresponding GitHub release,
untagged builds to the GitHub 'CI' release.

LDC: Azure Windows CI: Upgrade clang to v8.0.1

LDC: Set up CI with Azure Pipelines and Shippable

Azure: Windows x86 & x64, macOS x64, Linux x64
Shippable: Linux AArch64

2 packages per platform (enabled/disabled assertions).

Tagged builds are uploaded to the corresponding GitHub release,
untagged builds to the GitHub 'CI' release.

CircleCI: Download prebuilt CMake package from GitHub

LDC: Use . instead of :: as CodeView DI scope separator

For compile units with D language tag, i.e., if compiled with `-g`.

Merge pull request #3 from ldc-developers/tls

Rework emulated TLS patch for Android

[LDC] PGO: Avoid COMDATs with private linkage (fixing PGO for Windows)

Upgrade LLD to v6.0.1-2, making LDC's -link-internally work for WebAs…

…sembly

LDC: Add MIPS, MSP430, RISC-V and WebAssembly targets for prebuilt pa…

…ckages

LDC: Add compiler-rt as git submodule