tools: fix invalid printing, buffer overrun in llvm-readobj

All auxiliary records are consumed when accessing a File record.

llvm-svn: 206354
diff --git a/llvm/test/tools/llvm-readobj/coff-file-sections-reading.test b/llvm/test/tools/llvm-readobj/coff-file-sections-reading.test
new file mode 100644
index 0000000..5c44c16
--- /dev/null
+++ b/llvm/test/tools/llvm-readobj/coff-file-sections-reading.test
@@ -0,0 +1,18 @@
+RUN: yaml2obj %p/Inputs/file-multiple-aux-records.yaml | llvm-readobj -t - | FileCheck %s
+
+CHECK: Symbols [
+CHECK:   Symbol {
+CHECK:     Name: .file
+CHECK:     Value: 0
+CHECK:     Section:  (65534)
+CHECK:     BaseType: Null (0x0)
+CHECK:     ComplexType: Null (0x0)
+CHECK:     StorageClass: File (0x67)
+CHECK:     AuxSymbolCount: 3
+CHECK:     AuxFileRecord {
+CHECK:       FileName: first-section-has-eighteen-characters.asm
+CHECK:     }
+CHECK-NOT:     AuxFileRecord {
+CHECK:   }
+CHECK: ]
+