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  1. MariaDB Server
  2. MDEV-11349

Fix warnings from clang 4.0.0 and Valgrind 3.12.0

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      Fix most InnoDB and XtraDB warnings from clang 4.0.

      In functions that declare pointer parameters as nonnull,
      remove nullness checks, because GCC would optimize them away anyway.

      Use #ifdef instead of #if when checking for a configuration flag.

      Clang says that left shifts of negative values are undefined.
      So, use ~0U instead of ~0 in a number of macros.

      Some functions that were defined as UNIV_INLINE were declared as
      UNIV_INTERN. Consistently use the same type of linkage.

      ibuf_merge_or_delete_for_page() could pass bitmap_page=NULL to
      buf_page_print(), conflicting with the _attribute_((nonnull)).

      Fix some bogus-looking Valgrind warnings.

      buf_block_init(): Initialize buf_page_t::flush_type.
      For some reason, Valgrind 3.12.0 would seem to flag some
      bits in adjacent bitfields as uninitialized, even though only
      the two bits of flush_type were left uninitialized. Initialize
      the field to get rid of many warnings.

      mach_write_to_1(), mach_write_to_2(), mach_write_to_3():
      Rewrite the assertions that ensure that the most significant
      bits are zero. Apparently, clang 4.0 would optimize expressions
      of the form ((n | 0xFF) <= 0x100) to (n <= 0x100). The redundant
      0xFF was added in the first place in order to suppress a
      Valgrind warning. (Valgrind would warn about comparing uninitialized
      values even in the case when the uninitialized bits do not affect
      the result of the comparison.)

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            marko Marko Mäkelä
            marko Marko Mäkelä
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