Update ReplacePtrsWithInts to also fix up refs from subprogram debug metadata.

test/Transforms/NaCl/replace-ptrs-with-ints.ll

 ; RUN: opt %s -replace-ptrs-with-ints -S | FileCheck %s
 
-!llvm.module.flags = !{!0}
-!0 = metadata !{i32 1, metadata !"Debug Info Version", i32 1}
-
 target datalayout = "p:32:32:32"
 
 
 %struct = type { i32, i32 }
 
 declare %struct* @addr_taken_func(%struct*)
 
 @addr_of_func = global %struct* (%struct*)* @addr_taken_func
 ; CHECK: @addr_of_func = global %struct* (%struct*)* bitcast (i32 (i32)* @addr_taken_func to %struct* (%struct*)*)
 
@@ skipping 476 matching lines @@
 
 define void @debug_declare(i32 %val) {
   ; We normally expect llvm.dbg.declare to be used on an alloca.
   %var = alloca i32
   tail call void @llvm.dbg.declare(metadata !{i32* %var}, metadata !{})
   tail call void @llvm.dbg.declare(metadata !{i32 %val}, metadata !{})
   ret void
 }
 ; CHECK: define void @debug_declare(i32 %val) {
 ; CHECK-NEXT: %var = alloca i8, i32 4
-; CHECK-NEXT: call void @llvm.dbg.declare(metadata !{i8* %var}, metadata !1)
+; CHECK-NEXT: call void @llvm.dbg.declare(metadata !{i8* %var}, metadata !2)
 ; This case is currently not converted.
-; CHECK-NEXT: call void @llvm.dbg.declare(metadata !{null}, metadata !1)
+; CHECK-NEXT: call void @llvm.dbg.declare(metadata !{null}, metadata !2)
 ; CHECK-NEXT: ret void
 
 ; For now, debugging info for values is lost.  replaceAllUsesWith()
 ; does not work for metadata references -- it converts them to nulls.
 ; This makes dbg.value too tricky to handle for now.
 define void @debug_value(i32 %val, i8* %ptr) {
   tail call void @llvm.dbg.value(metadata !{i32 %val}, i64 1, metadata !{})
   tail call void @llvm.dbg.value(metadata !{i8* %ptr}, i64 2, metadata !{})
   ret void
 }
 ; CHECK: define void @debug_value(i32 %val, i32 %ptr) {
-; CHECK-NEXT: call void @llvm.dbg.value(metadata !{null}, i64 1, metadata !1)
-; CHECK-NEXT: call void @llvm.dbg.value(metadata !{null}, i64 2, metadata !1)
+; CHECK-NEXT: call void @llvm.dbg.value(metadata !{null}, i64 1, metadata !2)
+; CHECK-NEXT: call void @llvm.dbg.value(metadata !{null}, i64 2, metadata !2)
 ; CHECK-NEXT: ret void
 
 
 declare void @llvm.lifetime.start(i64 %size, i8* %ptr)
 declare {}* @llvm.invariant.start(i64 %size, i8* %ptr)
 declare void @llvm.invariant.end({}* %start, i64 %size, i8* %ptr)
 
 ; GVN can introduce the following horrible corner case of a lifetime
 ; marker referencing a PHI node.  But we convert the phi to i32 type,
 ; and lifetime.start doesn't work on an inttoptr converting an i32 phi
@@ skipping 144 matching lines @@
 define void @typeid_for() {
   %bc = bitcast i32* @typeid to i8*
   call i32 @llvm.eh.typeid.for(i8* %bc)
   ret void
 }
 ; CHECK: define void @typeid_for() {
 ; CHECK-NEXT: %typeid.bc = bitcast i32* @typeid to i8*
 ; CHECK-NEXT: call i32 @llvm.eh.typeid.for(i8* %typeid.bc)
 
 
+; Subprogram debug metadata may refer to a function.
+; Make sure those are updated too.
+; Regenerate the debug info from the following C program:
+; void nop(void *ptr) {
+; }
+
+define void @nop(i8* %ptr) {
+  tail call void @llvm.dbg.value(metadata !{i8* %ptr}, i64 0, metadata !10), !dbg !14
+  ret void, !dbg !15
+}
+; CHECK: define void @nop(i32 %ptr) {
+; CHECK-NEXT: call void @llvm.dbg.value{{.*}}
+; CHECK-NEXT: ret void
+
+
 ; CHECK: attributes {{.*}}[[NOUNWIND]] = { nounwind }
+
+!llvm.dbg.cu = !{!0}
+!llvm.module.flags = !{!11, !12}
+!llvm.ident = !{!13}
+
+!0 = metadata !{i32 786449, metadata !1, i32 12, metadata !"clang version 3.5.0", i1 true, metadata !"", i32 0, metadata !2, metadata !2, metadata !3, metadata !2, metadata !2, metadata !"", i32 1} ; [ DW_TAG_compile_unit ] [/home/foo/test_min.c] [DW_LANG_C99]
+!1 = metadata !{metadata !"test_min.c", metadata !"/home/foo"}
+!2 = metadata !{}
+!3 = metadata !{metadata !4}
+!4 = metadata !{i32 786478, metadata !1, metadata !5, metadata !"nop", metadata !"nop", metadata !"", i32 1, metadata !6, i1 false, i1 true, i32 0, i32 0, null, i32 256, i1 true, void (i8*)* @nop, null, null, metadata !9, i32 1} ; [ DW_TAG_subprogram ] [line 1] [def] [nop]
+!5 = metadata !{i32 786473, metadata !1}          ; [ DW_TAG_file_type ] [/home/foo/test_min.c]
+!6 = metadata !{i32 786453, i32 0, null, metadata !"", i32 0, i64 0, i64 0, i64 0, i32 0, null, metadata !7, i32 0, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
+!7 = metadata !{null, metadata !8}
+!8 = metadata !{i32 786447, null, null, metadata !"", i32 0, i64 32, i64 32, i64 0, i32 0, null} ; [ DW_TAG_pointer_type ] [line 0, size 32, align 32, offset 0] [from ]
+!9 = metadata !{metadata !10}
+!10 = metadata !{i32 786689, metadata !4, metadata !"ptr", metadata !5, i32 16777217, metadata !8, i32 0, i32 0} ; [ DW_TAG_arg_variable ] [ptr] [line 1]
+!11 = metadata !{i32 2, metadata !"Dwarf Version", i32 4}
+!12 = metadata !{i32 2, metadata !"Debug Info Version", i32 1}
+!13 = metadata !{metadata !"clang version 3.5.0"}
+!14 = metadata !{i32 1, i32 16, metadata !4, null}
+!15 = metadata !{i32 2, i32 1, metadata !4, null}
+
+; CHECK: !4 = metadata !{{{.*}}nop{{.*}}, void (i32)* @nop, {{.*}}} ; [ DW_TAG_subprogram ] [line 1] [def] [nop]