[AIX][PGO] Add malloc error handling and deallocation to FindBinaryId function

[w2yehia]

Summary

This is a follow up on https://reviews.llvm.org/D146976

compiler-rt/lib/profile/InstrProfilingPlatformAIX.c

static size_t FindBinaryId(char *Result, size_t Size) {
   char *BufPtr = Buf;
   int RC = -1;
 
   errno = 0;
   RC = loadquery(L_GETXINFO | L_IGNOREUNLOAD, BufPtr, (unsigned int)BufSize);
   if (RC == -1 && errno == ENOMEM) {
     BufSize = 64000; // should be plenty for any program.
     BufPtr = malloc(BufSize);
+    if (BufPtr != 0)
       RC = loadquery(L_GETXINFO | L_IGNOREUNLOAD, BufPtr, (unsigned int)BufSize);
   }
 
   if (RC == -1)
-    return RC;
+    goto done;
 
   // Locate the ld_xinfo corresponding to this module.
   struct ld_xinfo *CurInfo = (struct ld_xinfo *)BufPtr;
   while (1) {
     unsigned long CurTextStart = (uint64_t)CurInfo->ldinfo_textorg;
     unsigned long CurTextEnd = CurTextStart + CurInfo->ldinfo_textsize;
     if (CurTextStart <= EntryAddr && EntryAddr < CurTextEnd) {
       // Found my slot. Now search for the build-id.