am 20cc6b69: Merge remote-tracking branch \'goog/lmp-mr1-ub-dev\' into manualmerge
* commit '20cc6b695a8ceaf801f53f0526f0ed5d588d7d9d': Fix the type of u_ar0 in <sys/user.h>. Add greg_t for arm64. POSIX says <signal.h> gets you ucontext_t. Add in_port_t and move it and in_addr_t to the correct header file. Add stpcpy assembler version. Cleanup arm assembly. Add __memcpy_chk assembly for 64 bit. Clean up the architecture-specific makefiles. No arm source refers to SOFTFLOAT.
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