Update arch-specific section flag test

Author: Il-Capitano

llvm/test/tools/llvm-readobj/ELF/section-arch-flags.test

@@ -117,7 +117,7 @@ Sections:
     Type:  SHT_PROGBITS
     Flags: [ SHF_X86_64_LARGE, SHF_EXCLUDE ]
 
-# RUN: yaml2obj --docnum 5 %s -o %t-arm.o
+# RUN: yaml2obj --docnum 5 -DARCH=ARM %s -o %t-arm.o
 # RUN: llvm-readobj -S %t-arm.o | FileCheck --check-prefix=ARM-LLVM %s
 # RUN: llvm-readelf -S %t-arm.o | FileCheck --check-prefix=ARM-GNU %s
 
@@ -128,18 +128,7 @@ Sections:
 # ARM-GNU: [Nr] Name Type     Address          Off    Size   ES Flg Lk Inf Al
 # ARM-GNU: [ 1] foo  PROGBITS 0000000000000000 000040 000000 00   y 0   0  0
 
---- !ELF
-FileHeader:
-  Class:   ELFCLASS64
-  Data:    ELFDATA2LSB
-  Type:    ET_REL
-  Machine: EM_ARM
-Sections:
-  - Name:  foo
-    Type:  SHT_PROGBITS
-    Flags: [ SHF_ARM_PURECODE ]
-
-# RUN: yaml2obj --docnum 6 %s -o %t-aarch64.o
+# RUN: yaml2obj --docnum 5 -DARCH=AARCH64 %s -o %t-aarch64.o
 # RUN: llvm-readobj -S %t-aarch64.o | FileCheck --check-prefix=AARCH64-LLVM %s
 # RUN: llvm-readelf -S %t-aarch64.o | FileCheck --check-prefix=AARCH64-GNU %s
 
@@ -155,8 +144,8 @@ FileHeader:
   Class:   ELFCLASS64
   Data:    ELFDATA2LSB
   Type:    ET_REL
-  Machine: EM_AARCH64
+  Machine: EM_[[ARCH]]
 Sections:
   - Name:  foo
     Type:  SHT_PROGBITS
-    Flags: [ SHF_AARCH64_PURECODE ]
+    Flags: [ SHF_[[ARCH]]_PURECODE ]