FROMLIST: ARM: kprobes: rewrite test-arm.c in UAL

Clang's integrated assembler only accepts UAL syntax, rewrite the
instructions that were changed by RVCTv2.1.  The document "Assembly
language changes after RVCTv2.1" was very helpful.

  .syntax unified

directive is added, since -masm-syntax-unified is unreliable for older
but supported versions of GCC. See also:

commit fe09d9c ("ARM: 8852/1: uaccess: use unified assembler language syntax")

Reported-by: Arnd Bergmann <[email protected]>
Signed-off-by: Nick Desaulniers <[email protected]>
Reviewed-by: Nathan Chancellor <[email protected]>
Acked-by: Ard Biesheuvel <[email protected]>
Link: https://developer.arm.com/documentation/dui0473/c/writing-arm-assembly-language/assembly-language-changes-after-rvctv2-1
Link: ClangBuiltLinux/linux#1271
Bug: 141693040
Link: https://lore.kernel.org/linux-arm-kernel/[email protected]/
Change-Id: Icbd266fce538460c64900e2fa0f032561e208363

Author: nickdesaulniers