[bindings/go] Add DebugLoc parameter to InsertXXXAtEnd()

[ben-clayton]

Summary

These functions previously passed nil for the location, which always resulted in a crash.

This is a signature breaking change, but I cannot see how they could have been used before.

[pcc]

LGTM

Signature changes are fine for this package, the API guarantees are the same as for the C bindings: https://llvm.org/docs/DeveloperPolicy.html#c-api-changes

bindings/go/llvm/dibuilder.go

if len(addr) > 0 {
     data = (*C.int64_t)(unsafe.Pointer(&addr[0]))
   }
   result := C.LLVMDIBuilderCreateExpression(d.ref, data, C.size_t(len(addr)))
   return Metadata{C: result}
 }
 
 // InsertDeclareAtEnd inserts a call to llvm.dbg.declare at the end of the
 // specified basic block for the given value and associated debug metadata.
-func (d *DIBuilder) InsertDeclareAtEnd(v Value, diVarInfo, expr Metadata, bb BasicBlock) Value {
-  result := C.LLVMDIBuilderInsertDeclareAtEnd(d.ref, v.C, diVarInfo.C, expr.C, nil, bb.C)
+func (d *DIBuilder) InsertDeclareAtEnd(v Value, diVarInfo, expr Metadata, l DebugLoc, bb BasicBlock) Value {
+  loc := C.LLVMDIBuilderCreateDebugLocation(
+    d.m.Context().C, C.uint(l.Line), C.uint(l.Col), l.Scope.C, l.InlinedAt.C)
+  result := C.LLVMDIBuilderInsertDeclareAtEnd(d.ref, v.C, diVarInfo.C, expr.C, loc, bb.C)
   return Value{C: result}
 }
 
 // InsertValueAtEnd inserts a call to llvm.dbg.value at the end of the
 // specified basic block for the given value and associated debug metadata.
-func (d *DIBuilder) InsertValueAtEnd(v Value, diVarInfo, expr Metadata, bb BasicBlock) Value {
-  result := C.LLVMDIBuilderInsertDbgValueAtEnd(d.ref, v.C, diVarInfo.C, expr.C, nil, bb.C)
+func (d *DIBuilder) InsertValueAtEnd(v Value, diVarInfo, expr Metadata, l DebugLoc, bb BasicBlock) Value {
+  loc := C.LLVMDIBuilderCreateDebugLocation(
+    d.m.Context().C, C.uint(l.Line), C.uint(l.Col), l.Scope.C, l.InlinedAt.C)
+  result := C.LLVMDIBuilderInsertDbgValueAtEnd(d.ref, v.C, diVarInfo.C, expr.C, loc, bb.C)
   return Value{C: result}
 }
 
 func (v Value) SetSubprogram(sp Metadata) {
   C.LLVMSetSubprogram(v.C, sp.C)
 }
 
 func boolToCInt(v bool) C.int {