[SjLj] Remove old unused library methods (#21613)

After llvm/llvm-project#84137 and #21502, these
methods are no longer used.

system/lib/compiler-rt/emscripten_setjmp.c

@@ -11,58 +11,8 @@
 #include <setjmp.h>
 #include <threads.h>
 
-// 0 - Nothing thrown
-// 1 - Exception thrown
-// Other values - jmpbuf pointer in the case that longjmp was thrown
-static uintptr_t setjmpId = 0;
-
-typedef struct TableEntry {
-  uintptr_t id;
-  uint32_t label;
-} TableEntry;
-
-extern void setTempRet0(uint32_t value);
 extern void setThrew(uintptr_t threw, int value);
 
-TableEntry* saveSetjmp(uintptr_t* env, uint32_t label, TableEntry* table, uint32_t size) {
-  // Not particularly fast: slow table lookup of setjmpId to label. But setjmp
-  // prevents relooping anyhow, so slowness is to be expected. And typical case
-  // is 1 setjmp per invocation, or less.
-  uint32_t i = 0;
-  setjmpId++;
-  *env = setjmpId;
-  while (i < size) {
-    if (table[i].id == 0) {
-      table[i].id = setjmpId;
-      table[i].label = label;
-      // prepare next slot
-      table[i + 1].id = 0;
-      setTempRet0(size);
-      return table;
-    }
-    i++;
-  }
-  // grow the table
-  size *= 2;
-  table = (TableEntry*)realloc(table, sizeof(TableEntry) * (size +1));
-  table = saveSetjmp(env, label, table, size);
-  setTempRet0(size); // FIXME: unneeded?
-  return table;
-}
-
-uint32_t testSetjmp(uintptr_t id, TableEntry* table, uint32_t size) {
-  uint32_t i = 0;
-  while (i < size) {
-    uintptr_t curr = table[i].id;
-    if (curr == 0) break;
-    if (curr == id) {
-      return table[i].label;
-    }
-    i++;
-  }
-  return 0;
-}
-
 #if !defined(__USING_WASM_SJLJ__)
 
 #include "emscripten_internal.h"