[test][MC] Rehabilitate llvm/test/MC/COFF/bigobj.py

[hubert.reinterpretcast]

Summary

The subject test was not actually running. This patch adds the relevant suffix to the list of lit case filename extensions for the enclosing directory.

Minor adjustments are also made to deal with bit rot.

[daltenty]

LGTM

llvm/test/MC/COFF/bigobj.py

-# RUN: python %s | llvm-mc -filetype=obj -triple i686-pc-win32 - | llvm-readobj -h | FileCheck %s
+# RUN: python %s | llvm-mc -filetype=obj -triple i686-pc-win32 - | llvm-readobj -h - | FileCheck %s
 
 from __future__ import print_function
 
 # This test checks that the COFF object emitter can produce objects with
 # more than 65279 sections.
 
 # While we only generate 65277 sections, an implicit .text, .data and .bss will
 # also be emitted.  This brings the total to 65280.
 num_sections = 65277
 
 # CHECK:      ImageFileHeader {
 # CHECK-NEXT:   Machine: IMAGE_FILE_MACHINE_I386
 # CHECK-NEXT:   SectionCount: 65280
 # CHECK-NEXT:   TimeDateStamp: {{[0-9]+}}
 # CHECK-NEXT:   PointerToSymbolTable: 0x{{[0-9A-F]+}}
 # CHECK-NEXT:   SymbolCount: 195837
+# CHECK-NEXT:   StringTableSize: {{[0-9]+}}
 # CHECK-NEXT:   OptionalHeaderSize: 0
 # CHECK-NEXT:   Characteristics [ (0x0)
 # CHECK-NEXT:   ]
 # CHECK-NEXT: }
 
 for i in range(0, num_sections):
   print("""  .section  .bss,"bw",discard,_b%d
   .globl  _b%d                     # @b%d
 _b%d:
   .byte 0                       # 0x0
 """ % (i, i, i, i))

llvm/test/MC/COFF/lit.local.cfg

 if not 'X86' in config.root.targets:
     config.unsupported = True
+
+config.suffixes.add('.py')