LDC 1.27.1

Big news

• Frontend, druntime and Phobos are at version 2.097.2. (#3811)
• Revamped and improved -ftime-trace implementation for compiler profiling/tracing, now excluding LLVM-internal traces, adding frontend memory tracing, source file location infos etc. (#3797)
• An official prebuilt package for Linux AArch64 is available again after migrating from Shippable to Travis. (#3733)

Bug fixes

• ICE for 64-bit targets with 32-bit pointer size. (#3802, #3808)
• Implement core.atomic.pause() for some architectures. (#3806, #3807)