Fix ui constant tests for big-endian platforms

A number of tests under ui/const-ptr and ui/consts are currently
failing on big-endian platforms as the binary encoding of some
constants is hard-coded in the stderr test files.  Fix this by
providing a normalize-stderr-test rule that strips out the
raw bytes hex dump, so the comparison can be done in an
endianness-independent manner.  Note that in most cases, this
means the tests are now also independent of word size, so the
32bit and 64bit cases can be re-unified.

To keep tests that verify the details of those raw bytes dumps,
a new test case raw-bytes.rs performs the tests where the hex
dumps were stripped out a second time, but only on little-
endian platforms.

In addition, src/test/ui/const-ptr/forbidden_slices.rs exposes
an endian-specific difference in this diagnostic output:
   constructing invalid value at .<deref>[0]: encountered 0x11,
   but expected a boolean
depending on which byte of D0 is not a boolean value (0 or 1).
Fixed this by choosing a value of D0 that differs from 0 or 1
in all bytes.

Fixes part of https://github.com/rust-lang/rust/issues/105383.

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