Fix stmt-seq-macho.test for little endian platforms

The test YAML was created on a little-endian system, so its data is stored in little-endian order. When the test runs on a big-endian host, yaml2obj defaults to the host’s byte order, misreading the file as big-endian and causing a failure.

This change explicitly marks the YAML as little-endian, guaranteeing that yaml2obj always uses the correct byte order, no matter which machine runs the test.

Author: alx32

llvm/test/tools/dsymutil/ARM/stmt-seq-macho.test

@@ -83,14 +83,15 @@ ld64.lld \
 
 # Convert executable to YAML for the test
 echo "#--- stmt_seq_macho.o.yaml"
-obj2yaml stmt_seq_macho.o
+obj2yaml stmt_seq_macho.o | sed '1a IsLittleEndian: true'
 echo ""
 echo "#--- stmt_seq_macho.exe.yaml"
-obj2yaml stmt_seq_macho.exe
+obj2yaml stmt_seq_macho.exe | sed '1a IsLittleEndian: true'
 
 #--- stmt-seq-macho.yaml
 #--- stmt_seq_macho.o.yaml
 --- !mach-o
+IsLittleEndian: true
 FileHeader:
   magic:           0xFEEDFACF
   cputype:         0x100000C
@@ -1564,6 +1565,7 @@ DWARF:
 
 #--- stmt_seq_macho.exe.yaml
 --- !mach-o
+IsLittleEndian: true
 FileHeader:
   magic:           0xFEEDFACF
   cputype:         0x100000C