Load symbols from the unstripped ELF homebrew ships next to its EBOOT

Homebrew almost always ships the ELF it was built from alongside the EBOOT -
app.elf next to app.prx - but prxgen strips the symbol table on the way to the
PRX, so the module PPSSPP loads has no names at all and MIPSAnalyst calls every
function it finds z_un_<address>. Working out what any of them are meant hand-
parsing that ELF with a throwaway script, which is how the CrossCraft
relocation bug got identified.

So read it directly. On module load, scan the game's own directory for an ELF
with a symbol table and add its STT_FUNC/STT_OBJECT entries at the module's
base. CrossCraft picks up 3734 symbols, and the disassembly turns from
z_un_088c00f0 into world.init_empty, with static_allocator.alloc at the vtable
entry it calls - the two functions that took the longest to identify by hand.

Matching is the part worth getting right, since a wrong match puts confident
nonsense at real addresses, which beats having no names only in the sense that
it's worse. A candidate has to be a 32-bit ELF with a symbol table whose
highest section ends within a page of the loaded module's size - the companion
links at base 0 and covers the same image, so that's a tight check, and
unrelated ELFs sitting in the same folder fail it. Symbols outside the module
are skipped individually too.

Names go in with updateName, so they win over the analyzer's placeholders
rather than losing to whichever got there first. Gated on the existing
bAutoSaveLoadSymbols setting (off by default), which already means "keep symbol
names around for me" and avoids a directory scan per module load otherwise.

pspautotests 314/314.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GZq8ZtJmFY7bkX5FVkr3P9

Core/HLE/sceKernelModule.cpp

@@ -1373,6 +1373,10 @@ static PSPModule *__KernelLoadELFFromPtr(const u8 *ptr, size_t elfSize, u32 load
 			if (idx > 0) {
 				g_symbolMap->LoadModuleSymbols(idx, SymbolMap::GetModuleSymbolsPath(moduleName, module->crc));
 			}
+			// Homebrew commonly ships the unstripped ELF next to the EBOOT; prxgen strips the
+			// symbols out of the PRX we actually load, so without this every function in it is
+			// just z_un_<address>. See LoadCompanionElfSymbols.
+			LoadCompanionElfSymbols(PSP_CoreParameter().fileToStart, module->memoryBlockAddr, module->memoryBlockSize);
 		}
 	}