__ubsan_handle_type_mismatch converted to __ubsan_handle_type_mismatch_v1

[Sodagudi Prasad]

Hi All,

Based on below links __ubsan_handle_type_mismatch has been renamed to  
__ubsan_handle_type_mismatch_v1.

https://github.com/llvm-mirror/compiler-rt/commit/56faee71af1888ba12ab076b3d1f9bbe223493df#diff-21369cc6f3917b27df3ced8de89cf134
https://www.mail-archive.com/gcc-bugs@xxxxxxxxxxx/msg535130.html


When I tried to compile the kernel with LLVM seen following errors.
arch/arm64/kernel/traps.o: In function `dump_backtrace':
kernel/arch/arm64/kernel/traps.c:192: undefined reference to 
`__ubsan_handle_type_mismatch_v1'
kernel/arch/arm64/kernel/traps.c:192: undefined reference to 
`__ubsan_handle_type_mismatch_v1'
kernel/arch/arm64/kernel/traps.c:192: undefined reference to 
`__ubsan_handle_type_mismatch_v1'
kernel/arch/arm64/kernel/traps.c:192: undefined reference to 
`__ubsan_handle_type_mismatch_v1'
arch/arm64/kernel/traps.o: In function `dump_mem':


Can I add __ubsan_handle_type_mismatch_v1 API similar to  
__ubsan_handle_type_mismatch()(I will send path for review)?
If both apis are present, then there will be backward compatibility.  
Let me know if you have any other suggestions for this issue.

-Thanks, Prasad

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