Sink MachineFunction private method out of line

This method is private and only called from this file and doesn't need
to be inline. Saves a TargetMachine.h include in MachineFunction.h, a
popular header. The include was introduced in 98603a8153 despite the
forward decl of LLVMTargetMachine.

llvm/include/llvm/CodeGen/MachineFunction.h

@@ -36,7 +36,6 @@
 #include "llvm/Support/Compiler.h"
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/Recycler.h"
-#include "llvm/Target/TargetMachine.h"
 #include <cassert>
 #include <cstdint>
 #include <memory>
@@ -403,14 +402,7 @@ private:
 
   /// A helper function that returns call site info for a give call
   /// instruction if debug entry value support is enabled.
-  CallSiteInfoMap::iterator getCallSiteInfo(const MachineInstr *MI) {
-    assert(MI->isCall() &&
-           "Call site info refers only to call instructions!");
-
-    if (!Target.Options.EnableDebugEntryValues)
-      return CallSitesInfo.end();
-    return CallSitesInfo.find(MI);
-  }
+  CallSiteInfoMap::iterator getCallSiteInfo(const MachineInstr *MI);
 
   // Callbacks for insertion and removal.
   void handleInsertion(MachineInstr &MI);

llvm/lib/CodeGen/MachineFunction.cpp

@@ -830,6 +830,15 @@ try_next:;
   return FilterID;
 }
 
+MachineFunction::CallSiteInfoMap::iterator
+MachineFunction::getCallSiteInfo(const MachineInstr *MI) {
+  assert(MI->isCall() && "Call site info refers only to call instructions!");
+
+  if (!Target.Options.EnableDebugEntryValues)
+    return CallSitesInfo.end();
+  return CallSitesInfo.find(MI);
+}
+
 void MachineFunction::moveCallSiteInfo(const MachineInstr *Old,
                                        const MachineInstr *New) {
   assert(New->isCall() && "Call site info refers only to call instructions!");