When CONFIG_MALLOC_DEBUG is enabled, add an optional caller string
parameter to dlmalloc_impl(). This allows tracking where allocations
originate from when debugging memory issues.
The CALLER_PARAM, CALLER_ARG, and CALLER_NULL macros hide the parameter
when MALLOC_DEBUG is not enabled, keeping the non-debug code path clean.
When MALLOC_DEBUG is enabled (with or without MCHECK), the _impl
functions must be separate from the public API functions since they
have different signatures. Add simple pass-through wrappers for this
case.
Co-developed-by: Claude <noreply@anthropic.com>
Signed-off-by: Simon Glass <simon.glass@canonical.com>
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