Align addresses to cache lines in __clear_cache for aarch64.

This corrects an issue where if the start and end address fall in different
lines, and the end address is not cache line size aligned, th

Align addresses to cache lines in __clear_cache for aarch64.

This corrects an issue where if the start and end address fall in different
lines, and the end address is not cache line size aligned, the last line
will not be invalidated properly.

Patch from compiler-rt upstream: https://reviews.llvm.org/rCRT323315

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Implement __clear_cache using __syncicache on PPC

Add __clear_cache implementatin for SPARC/SPARC64.

Import compiler-rt r259194. Primary changes are better support for
128bit long double and a number of refinements in the profiling backend.

Import compiler-rt r208593. Fix a build bug in __clear_cache by not
explicitly forcing the ABI. Add first part of IEEE 754 quad support.

Import compiler-rt r204194. Fixes shift use in divide routines and const
correctness in gcc_personality_v0.c.

Import compiler-rt r202303. Extend 128bit support to all LP64 platforms.