[GreedyRA ORE] Add debug location for function level report

llvm/lib/CodeGen/RegAllocGreedy.cpp

 #include "llvm/Support/BlockFrequency.h"
 #include "llvm/Support/BranchProbability.h"
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/Debug.h"
 #include "llvm/Support/MathExtras.h"
 #include "llvm/Support/Timer.h"
 #include "llvm/Support/raw_ostream.h"
 #include "llvm/Target/TargetMachine.h"
+#include "llvm/IR/DebugInfoMetadata.h"
 #include <algorithm>
 #include <cassert>
 #include <cstdint>
 #include <memory>
 #include <queue>
 #include <tuple>
 #include <utility>
 
void RAGreedy::reportNumberOfSplillsReloads() {
   // Process non-loop blocks.
   for (MachineBasicBlock &MBB : *MF)
     if (!Loops->getLoopFor(&MBB))
       Stats.add(computeNumberOfSplillsReloads(MBB));
   if (!Stats.isEmpty()) {
     using namespace ore;
 
     ORE->emit([&]() {
-      MachineOptimizationRemarkMissed R(DEBUG_TYPE, "SpillReload", DebugLoc(),
+      DebugLoc Loc;
+      if (auto *SP = MF->getFunction().getSubprogram())
+        Loc = DILocation::get(SP->getContext(), SP->getLine(), 1, SP);
+      MachineOptimizationRemarkMissed R(DEBUG_TYPE, "SpillReload", Loc,
                                         &MF->front());
       Stats.report(R);
       R << "generated in function";
       return R;
     });
   }
 }
 

llvm/test/CodeGen/AArch64/arm64-spill-remarks.ll

 
 ; (loop3:)
 ; REMARK: remark: /tmp/kk.c:3:20: 1 spills 1 reloads generated in loop{{$}}
 ; (loop2:)
 ; REMARK: remark: /tmp/kk.c:2:20: 1 spills 1 reloads generated in loop{{$}}
 ; (loop:)
 ; REMARK: remark: /tmp/kk.c:1:20: 2 spills 2 reloads generated in loop{{$}}
 ; (func:)
-; REMARK: remark: <unknown>:0:0: 3 spills 3 reloads generated in function{{$}}
+; REMARK: remark: /tmp/kk.c:1:1: 3 spills 3 reloads generated in function{{$}}
 
 ; (loop3:)
 ; HOTNESS: remark: /tmp/kk.c:3:20: 1 spills 1 reloads generated in loop (hotness: 300)
 ; (loop2:)
 ; HOTNESS: remark: /tmp/kk.c:2:20: 1 spills 1 reloads generated in loop (hotness: 30000)
 ; (loop:)
 ; HOTNESS: remark: /tmp/kk.c:1:20: 2 spills 2 reloads generated in loop (hotness: 300)
 

 ; YAML:   - String:          ' spills '
 ; YAML:   - NumReloads:      '2'
 ; YAML:   - String:          ' reloads '
 ; YAML:   - String:          generated in loop
 ; YAML: ...
 ; YAML: --- !Missed
 ; YAML: Pass:            regalloc
 ; YAML: Name:            SpillReload
+; YAML: DebugLoc:        { File: '/tmp/kk.c', Line: 1, Column: 1 }
 ; YAML: Function:        fpr128
 ; YAML: Hotness:         3
 ; YAML: Args:
 ; YAML:   - NumSpills:       '3'
 ; YAML:   - String:          ' spills '
 ; YAML:   - NumReloads:      '3'
 ; YAML:   - String:          ' reloads '
 ; YAML:   - String:          generated in function

 ; THRESHOLD_YAML: Args:
 ; THRESHOLD_YAML:   - NumSpills:       '1'
 ; THRESHOLD_YAML:   - String:          ' spills '
 ; THRESHOLD_YAML:   - NumReloads:      '1'
 ; THRESHOLD_YAML:   - String:          ' reloads '
 ; THRESHOLD_YAML:   - String:          generated in loop
 ; THRESHOLD_YAML: ...
 
-define void @fpr128(<4 x float>* %p) nounwind ssp !prof !11 {
+define void @fpr128(<4 x float>* %p) nounwind ssp !prof !11 !dbg !6 {
 entry:
   br label %loop, !dbg !8
 
 loop:
   %i = phi i32 [ 0, %entry], [ %i.2, %end2 ]
   br label %loop2, !dbg !9
 
 loop2: