Autogenerated filename string symbol is incompatible with some assemblers

[expipiplus1]

The assembler for the Gameboy Advance specifically, part of devkitARM.

rustc outputs the LLVM IR constant : @"strName(956)" = internal constant [8 x i8] c"hello.rs"
This is faithfully translated to

"strName(956)":
        .ascii  "hello.rs"
        .size   "strName(956)", 8

This version of as can't deal with quotes and brackets in symbol names. For this assembler it'll be necessary to mangle any offending symbol names.