[CodeGen] Tweak whitespace in LiveInterval printing

[foad]

Summary

When printing a LiveInterval, tweak the use of single and double spaces
to try to make it clearer that the valnos are associated with the
preceding range or subrange, not the following subrange.

Compare the output before and then after this patch:
%1 [32r,144r:0) 0@32r L000000000000000C [32r,144r:0) 0@32r L00000000000000F3 [32r,32d:0) 0@32r weight:0.000000e+00
%1 [32r,144r:0) 0@32r L000000000000000C [32r,144r:0) 0@32r L00000000000000F3 [32r,32d:0) 0@32r weight:0.000000e+00

[arsenm]

I don't see the difference in the example, but maybe phabricator just ate the whitespace differences

llvm/lib/CodeGen/LiveInterval.cpp

1023

Single quotes now

[foad]

In D113671#3124424, @arsenm wrote:

I don't see the difference in the example, but maybe phabricator just ate the whitespace differences

The Edit Revision button in the web UI will show it to you with full whitespace.

[foad]

Single quotes.

llvm/lib/CodeGen/LiveInterval.cpp

else {
     for (const Segment &S : segments) {
       OS << S;
       assert(S.valno == getValNumInfo(S.valno->id) && "Bad VNInfo");
     }
   }
 
   // Print value number info.
   if (getNumValNums()) {
-    OS << "  ";
+    OS << ' ';
     unsigned vnum = 0;
     for (const_vni_iterator i = vni_begin(), e = vni_end(); i != e;
          ++i, ++vnum) {
       const VNInfo *vni = *i;
       if (vnum) OS << ' ';
       OS << vnum << '@';
       if (vni->isUnused()) {
         OS << 'x';
       } else {
         OS << vni->def;
         if (vni->isPHIDef())
           OS << "-phi";
       }
     }
   }
 }
 
 void LiveInterval::SubRange::print(raw_ostream &OS) const {
-  OS << " L" << PrintLaneMask(LaneMask) << ' '
-     << static_cast<const LiveRange&>(*this);
+  OS << "  L" << PrintLaneMask(LaneMask) << ' '
+     << static_cast<const LiveRange &>(*this);
 }
 
 void LiveInterval::print(raw_ostream &OS) const {
   OS << printReg(reg()) << ' ';
   super::print(OS);
   // Print subranges
   for (const SubRange &SR : subranges())
     OS << SR;
-  OS << " weight:" << Weight;
+  OS << "  weight:" << Weight;
 }
 
 #if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
 LLVM_DUMP_METHOD void LiveRange::dump() const {
   dbgs() << *this << '\n';
 }
 
 LLVM_DUMP_METHOD void LiveInterval::SubRange::dump() const {