[llvm-readobj] - Simplify the symbols.test

[grimar]

Summary

We are able to use YAML macros to avoid having
4 independent YAML descriptions.

[jhenderson]

LGTM!

llvm/test/tools/llvm-readobj/ELF/symbols.test

 ## This is a general test for --symbols option and its aliases.
 ## There are also other symbols* tests that check specific things.
 
 ## For testing and behavior documenting purposes we are using ET_REL and ET_DYN inputs.
 ## Relocatable ELF objects are very different by nature from executables and dynamic libraries.
 ## They might never have dynamic symbols normally, for example, though we still want
 ## to document the --dyn-symbols behavior.
 ## There is no need to check ET_EXEC inputs because for dumpers there is no difference
 ## between them and ET_DYN inputs in the context of this test.
 
 ## Case 1: Test how llvm-readobj and llvm-readelf dumps symbols.
 ## a) Check relocatable objects.
-# RUN: yaml2obj %s --docnum=1 -o %t64
+# RUN: yaml2obj %s -DBITS=64 -DTYPE=ET_REL -o %t64
 # RUN: llvm-readobj --symbols %t64 | FileCheck %s --match-full-lines --strict-whitespace --check-prefix=SYMBOLS-LLVM
 # RUN: llvm-readelf --symbols %t64 | FileCheck %s --match-full-lines --strict-whitespace --check-prefix=SYMBOLS-GNU64
-# RUN: yaml2obj %s --docnum=2 -o %t32
+# RUN: yaml2obj %s -DBITS=32 -DTYPE=ET_REL -o %t32
 # RUN: llvm-readobj --symbols %t32 | FileCheck %s --match-full-lines --strict-whitespace --check-prefix=SYMBOLS-LLVM
 # RUN: llvm-readelf --symbols %t32 | FileCheck %s --match-full-lines --strict-whitespace --check-prefix=SYMBOLS-GNU32
 ## b) Check dynamic objects.
-# RUN: yaml2obj %s --docnum=3 -o %t64.so
+# RUN: yaml2obj %s -DBITS=64 -DTYPE=ET_DYN -o %t64.so
 # RUN: llvm-readobj --symbols %t64.so | FileCheck %s --match-full-lines --strict-whitespace --check-prefix=SYMBOLS-LLVM
 # RUN: llvm-readelf --symbols %t64.so | FileCheck %s --match-full-lines --strict-whitespace --check-prefix=SYMBOLS-GNU64
-# RUN: yaml2obj %s --docnum=4 -o %t32.so
+# RUN: yaml2obj %s -DBITS=32 -DTYPE=ET_DYN -o %t32.so
 # RUN: llvm-readobj --symbols %t32.so | FileCheck %s --match-full-lines --strict-whitespace --check-prefix=SYMBOLS-LLVM
 # RUN: llvm-readelf --symbols %t32.so | FileCheck %s --match-full-lines --strict-whitespace --check-prefix=SYMBOLS-GNU32
 
 #      SYMBOLS-LLVM:Symbols [
 # SYMBOLS-LLVM-NEXT:  Symbol {
 # SYMBOLS-LLVM-NEXT:    Name:  (0)
 # SYMBOLS-LLVM-NEXT:    Value: 0x0
 # SYMBOLS-LLVM-NEXT:    Size: 0

 # RUN: llvm-readelf --symbols %t64 | FileCheck %s --check-prefix=BOTH-GNU
 
 ## Case 5: Test that `--dyn-symbols` does not trigger `--symbols` implicitly.
 # RUN: llvm-readobj --dyn-symbols %t64 | FileCheck %s --implicit-check-not="{{^}}Symbols ["
 # RUN: llvm-readelf --dyn-symbols %t64 | FileCheck %s --implicit-check-not="Symbol table '.symtab'"
 
 --- !ELF
 FileHeader:
-  Class:   ELFCLASS64
+  Class:   ELFCLASS[[BITS]]
   Data:    ELFDATA2LSB
-  Type:    ET_REL
+  Type:    [[TYPE]]
   Machine: EM_X86_64
 Symbols:
   - Name:  foo
     Value: 0x1
   - Name:  bar
     Value: 0x2
 DynamicSymbols:
   - Name:  zed
-
---- !ELF
-FileHeader:
-  Class:   ELFCLASS32
-  Data:    ELFDATA2LSB
-  Type:    ET_REL
-  Machine: EM_386
-Symbols:
-  - Name:  foo
-    Value: 0x1
-  - Name:  bar
-    Value: 0x2
-DynamicSymbols:
-  - Name:  zed
-
---- !ELF
-FileHeader:
-  Class:   ELFCLASS64
-  Data:    ELFDATA2LSB
-  Type:    ET_DYN
-  Machine: EM_X86_64
-Symbols:
-  - Name:  foo
-    Value: 0x1
-  - Name:  bar
-    Value: 0x2
-DynamicSymbols:
-  - Name:  zed
-
---- !ELF
-FileHeader:
-  Class:   ELFCLASS32
-  Data:    ELFDATA2LSB
-  Type:    ET_DYN
-  Machine: EM_386
-Symbols:
-  - Name:  foo
-    Value: 0x1
-  - Name:  bar
-    Value: 0x2
-DynamicSymbols:
-  - Name:  zed