[profgen] Use a 64bit integer for &'ing the loadable address (#79930)

For the linux kernel, the loadable segments start at 0xffff... and thus
the 32 bit integer here was truncating all the meaningful bits. Grow it
to 64 bits.

Author: lanza

llvm/tools/llvm-profgen/ProfiledBinary.cpp

@@ -317,7 +317,7 @@ void ProfiledBinary::setPreferredTextSegmentAddresses(const ELFFile<ELFT> &Obj,
   // However such info isn't available at post-processing time, assuming
   // 4K page now. Note that we don't use EXEC_PAGESIZE from <linux/param.h>
   // because we may build the tools on non-linux.
-  uint32_t PageSize = 0x1000;
+  uint64_t PageSize = 0x1000;
   for (const typename ELFT::Phdr &Phdr : PhdrRange) {
     if (Phdr.p_type == ELF::PT_LOAD) {
       if (!FirstLoadableAddress)