[clang] clang driver: enable fast unaligned access for Android on RISCV64 (PR #85704)

[Fangrui Song via cfe-commits]

================
@@ -167,6 +167,10 @@ void riscv::getRISCVTargetFeatures(const Driver &D, const 
llvm::Triple &Triple,
     Features.push_back("-relax");
   }
 
+  // Android requires fast unaligned access on RISCV64.
----------------
MaskRay wrote:

This adds two +fast-unaligned-access if -mno-strict-align is specified. Best to 
update the following AddTargetFeature in case -mstrict-align is specified.

https://github.com/llvm/llvm-project/pull/85704
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