[WIP] rvv intrinsic 1.0+

[nihui]

• port segment load store
• port zvfh
• android riscv64 ci
• dispatch for rvv / xtheadvector / zvfh
• update linux riscv toolchain

depends on
ruyisdk/llvm-project#127
ruyisdk/llvm-project#128
ruyisdk/llvm-project#131
ruyisdk/llvm-project#132

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116590
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116591
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116592
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116593

tracking bug
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116594

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.22%. Comparing base (70310e9) to head (cfd92c3).
Report is 6 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5642      +/-   ##
==========================================
- Coverage   94.58%   94.22%   -0.36%     
==========================================
  Files         787      733      -54     
  Lines      248626   228457   -20169     
==========================================
- Hits       235164   215273   -19891     
+ Misses      13462    13184     -278     

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[sequencer]

Removing support to xtheadvector might speed up this PR?
xtheadvector is well-known for its ghost write bug, and community already has K1 as the alternative to RVV 1.0, maybe there is no real need for xtheadvector, we can just let it go :)