[CodeGen] Prune headers and move code out of line for build efficiency, NFC (#135622)

I noticed these destructors taking time with -ftime-trace and moved some
of them for minor build efficiency improvements.

The main impact of moving destructors out of line is that it avoids
requiring container fields containing other types from being complete,
i.e. one can have uptr<T> or vector<T> as a field with an incomplete
type T, and that means we can reduce transitive includes, as with
LegalizerInfo.h.

Move expensive getDebugOperandsForReg template out-of-line. The
std::function instantiation shows up in time trace even if you don't use
the function.

1 files changed, 22 insertions, 0 deletions

diff --git a/llvm/lib/CodeGen/MachineInstr.cpp b/llvm/lib/CodeGen/MachineInstr.cpp
index 2409e60..7e4a32f 100644
--- a/llvm/lib/CodeGen/MachineInstr.cpp
+++ b/llvm/lib/CodeGen/MachineInstr.cpp
@@ -794,6 +794,28 @@ bool MachineInstr::shouldUpdateAdditionalCallInfo() const {
   return isCandidateForAdditionalCallInfo();
 }
 
+template <typename Operand, typename Instruction>
+static iterator_range<
+    filter_iterator<Operand *, std::function<bool(Operand &Op)>>>
+getDebugOperandsForRegHelper(Instruction *MI, Register Reg) {
+  std::function<bool(Operand & Op)> OpUsesReg(
+      [Reg](Operand &Op) { return Op.isReg() && Op.getReg() == Reg; });
+  return make_filter_range(MI->debug_operands(), OpUsesReg);
+}
+
+iterator_range<filter_iterator<const MachineOperand *,
+                               std::function<bool(const MachineOperand &Op)>>>
+MachineInstr::getDebugOperandsForReg(Register Reg) const {
+  return getDebugOperandsForRegHelper<const MachineOperand, const MachineInstr>(
+      this, Reg);
+}
+
+iterator_range<
+    filter_iterator<MachineOperand *, std::function<bool(MachineOperand &Op)>>>
+MachineInstr::getDebugOperandsForReg(Register Reg) {
+  return getDebugOperandsForRegHelper<MachineOperand, MachineInstr>(this, Reg);
+}
+
 unsigned MachineInstr::getNumExplicitOperands() const {
   unsigned NumOperands = MCID->getNumOperands();
   if (!MCID->isVariadic())