The llvm-mc assembler for x86 uses '#' to start a mid-line comment, while arm32 uses '@'.  Those characters cause syntax errors for the other architecture.  There doesn't seem to be a common character for starting mid-line comments.

However, the /* ... */ style comment works in both (all?) cases.

(The '#' character at the start of a line, preceded by optional whitespace, starts a comment in both cases.)

BUG= none
TEST= ./pydir/szbuild_spec2k.py --force -v -O2 --filetype=asm --sz=--asm-verbose --target=arm32
TEST= ./pydir/szbuild_spec2k.py --force -v -O2 --filetype=asm --sz=--asm-verbose --target=x8632
R=kschimpf@google.com

Review URL: https://codereview.chromium.org/1521863002 .