[llvm] [llvm-size] Fix --totals option for Mach-O files (PR #157904)

[James Henderson via llvm-commits]

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@@ -16,6 +16,16 @@
 # CHECK-NEXT: [[FILE2]]
 # CHECK-NEXT:      18      36      72     126      7e (TOTALS)
 
+# RUN: yaml2obj %s --docnum=3 -o %t-macho.o
+# RUN: yaml2obj %s --docnum=4 -o %t-macho2.o
+# RUN: llvm-size --totals %t-macho.o %t-macho2.o \
+# RUN:   | FileCheck %s --check-prefix=MACHO-CHECK --strict-whitespace --match-full-lines --implicit-check-not={{.}} -DFILE1=%t-macho.o -DFILE2=%t-macho2.o
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jh7370 wrote:

```suggestion
# RUN: llvm-size --totals %t-macho.o %t-macho2.o | \
# RUN:   FileCheck %s --check-prefix=MACHO-CHECK --strict-whitespace \
# RUN:     --match-full-lines --implicit-check-not={{.}} -DFILE1=%t-macho.o -DFILE2=%t-macho2.o
```
Two things: a) the FileCheck command should be split over multiple lines, since it's getting quite long; b) I have a slight preference for continuing lines as in the above suggestion, since the trailing `| \` indicates the next line continues, but as a new command (i.e. there are no more args to come), while the indentation on the second line indicates it is a follow-on command from the previous one).

https://github.com/llvm/llvm-project/pull/157904