Compute the correct symbol size in llvm-nm even without --print-size

[Sunil_Srivastava]

Summary

In llvm-nm, the symbol size was being computed only with --print-size option,
even though it was being printed in other cases, such as with --format=posix.

This patch simply removes the guard, so that the size is computed
independently of the later decision to print it or not.

Fixes PR39997.

[thegameg]

LGTM, thanks!

test/tools/llvm-nm/X86/posixELF.test

 # RUN: llvm-nm -P %p/Inputs/hello.obj.elf-x86_64 | FileCheck %s
 
-CHECK: main T 0 0
+CHECK: main T 0 15
 CHECK: puts U 0 0

test/tools/llvm-nm/X86/response-file.test

 # RUN: echo "-P %p/Inputs/hello.obj.elf-x86_64" > %t-response
 # RUN: llvm-nm @%t-response | FileCheck %s
 
-CHECK: main T 0 0
+CHECK: main T 0 15
 CHECK: puts U 0 0

tools/llvm-nm/llvm-nm.cpp

for (BasicSymbolRef Sym : Symbols) {
       // If a "-s segname sectname" option was specified and this is a Mach-O
       // file and this section appears in this file, Nsect will be non-zero then
       // see if this symbol is a symbol from that section and if not skip it.
       if (Nsect && Nsect != getNsectInMachO(*MachO, Sym))
         continue;
       NMSymbol S = {};
       S.Size = 0;
       S.Address = 0;
-      if (PrintSize) {
-        if (isa<ELFObjectFileBase>(&Obj))
-          S.Size = ELFSymbolRef(Sym).getSize();
-      }
       if (PrintAddress && isa<ObjectFile>(Obj)) {
         SymbolRef SymRef(Sym);
         Expected<uint64_t> AddressOrErr = SymRef.getAddress();
         if (!AddressOrErr) {
           consumeError(AddressOrErr.takeError());
           break;
         }
         S.Address = *AddressOrErr;