When mcheck heap-protection is enabled, each allocation adds quite a
bit of overhead for headers and canaries. While this is needed for the
full allocator, it serves no purpose for pre-relocation allocations,
since:
1. Simple malloc is a bump allocator that cannot free memory
3. Mcheck's corruption-detection provides no benefit for non-freeable
memory
Since the pre-relocation heap space is limited (typically <16KB), this
overhead can exhaust the heap, causing boot failures.
Fix this by bypassing mcheck hooks in dlmalloc(), dlfree(),
dlmemalign() and dlcalloc() when called before relocation, directly
calling the simple malloc functions instead.
Co-developed-by: Claude Opus 4.5 <noreply@anthropic.com>
Signed-off-by: Simon Glass <simon.glass@canonical.com>
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